Control channel decoding configuration for cross-carrier scheduling

Abstract

Mechanisms are provided for cross-carrier scheduling from a first cell to a second cell in a wireless networking scheme. In one aspect, a method includes receiving, from a base station (BS), a first configuration for scheduling in a first cell having a first subcarrier spacing (SCS), where the first configuration is associated with a first search space in the first cell. The method also includes receiving, from the BS, a second configuration for scheduling in the first cell, where the second configuration is associated with a second search space in a second cell, and where the second cell is associated with a different second SCS. The method further includes determining a number of blind detections (BDs) based on at least one of the first SCS or the second SCS, and monitoring for downlink control information (DCI) in the first search space and the second search space based on the number of BDs.

Description

[0001] Cross-references to related applications

[0002] This application claims the benefits and priority of U.S. Patent Application No. 17 / 448,702, filed September 23, 2021, and U.S. Provisional Patent Application No. 63 / 086,515, filed October 1, 2020, the entire contents of which are incorporated herein by reference. Technical Field

[0003] In general, this application relates to wireless communication systems, and more specifically, to downlink control information (DCI) monitoring and decoding configuration for cross-carrier scheduling in carrier aggregation systems. Background Technology

[0004] Wireless communication systems have been widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcasting, and so on. These systems can support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Wireless multiple access communication systems may include multiple base stations (BSs), each BS simultaneously supporting communication with multiple communication devices, which may otherwise be referred to as user equipment (UEs).

[0005] To meet the growing demand for extended mobile broadband connectivity, wireless communication technologies are evolving from Long Term Evolution (LTE) to Next Generation New Radio (NR) technologies, often referred to as fifth generation (5G). NR is designed to offer lower latency, higher bandwidth or throughput, and greater reliability than LTE. It is designed to operate across a wide range of frequency bands, from low-frequency bands below approximately 1 gigahertz (GHz), to mid-frequency bands from approximately 1 GHz to approximately 6 GHz, and to high-frequency bands such as millimeter wave (mmWave). NR is also designed to operate on various spectrum types, from licensed spectrum to unlicensed and shared spectrum. Spectrum sharing allows operators to opportunistically aggregate spectrum to dynamically support high-bandwidth services. Spectrum sharing can extend the advantages of NR technology to operating entities that may not have access to licensed spectrum.

[0006] Carrier aggregation (CA) is a capability in, for example, LTE and 5G NR that can combine two or more frequency bands or component carriers (CCs) to increase bandwidth. In some aspects, one CC can be used as an anchor carrier or primary cell (Pcell), and another CC can be used as a supplemental carrier or secondary cell (Scell). A Scell can include an uplink (UL) component carrier and a downlink (DL) component carrier. Alternatively, a Scell can include only a DL component carrier. In CA communication scenarios, cross-carrier scheduling can be used, whereby a UE monitors downlink communication information (DCI) (e.g., a downlink (DL) scheduling grant) on one cell (e.g., a Pcell) and receives downlink data (e.g., in a physical downlink shared channel (PDSCH)) on another cell (e.g., a Scell). Additionally or alternatively, the UE can monitor DCI (e.g., an uplink (UL) scheduling grant) on one cell and transmit UL data (e.g., in a physical uplink shared channel (PUSCH)) on another cell. SUMMARY

[0007] To provide an overall understanding of the technology discussed herein, certain aspects are summarized in the following. This summary is not an extensive overview of all contemplated features of the disclosure, nor is it intended to identify key or critical elements of the disclosure or to delineate the scope of the disclosure. Its sole purpose is to present some concepts of one or more aspects of the disclosure in a general framework so as to provide a basic understanding of the disclosure. The following summary presents a simplified summary of some aspects of the disclosure.

[0008] According to an aspect of the disclosure, a method of wireless communication performed by a user equipment (UE) includes receiving, from a base station (BS), a first configuration for scheduling in a first cell, wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first subcarrier spacing (SCS); receiving, from the BS, a second configuration for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS; determining a number of blind detections (BDs) based on at least one of the first SCS or the second SCS; and monitoring for downlink control information (DCI) in the first search space and the second search space based on the number of BDs.

[0009] According to another aspect of the disclosure, a method of wireless communication performed by a base station (BS) includes transmitting, to a user equipment (UE), a first configuration for scheduling in a first cell, wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first subcarrier spacing (SCS); transmitting, to the UE, a second configuration for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS; transmitting, to the UE, a third configuration indicating a third SCS associated with a number of blind detections (BDs) of downlink control information (DCI) in the first search space and the second search space, wherein the third SCS corresponds to one of the first SCS or the second SCS; and transmitting, to the UE, DCI in at least one of the first search space or the second search space based on the number of BDs of DCI.

[0010] According to another aspect of the disclosure, a UE includes a transceiver configured to receive, from a base station (BS), a first configuration for scheduling in a first cell, wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first subcarrier spacing (SCS); receive, from the BS, a second configuration for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS. The UE also includes a processor configured to determine a number of blind detections (BDs) based on at least one of the first SCS or the second SCS; and monitor for downlink control information (DCI) in the first search space and the second search space based on the number of BDs.

[0011] According to another aspect of the disclosure, a BS includes a transceiver configured to transmit, to a user equipment (UE), a first configuration for scheduling in a first cell, wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first subcarrier spacing (SCS); transmit, to the UE, a second configuration for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS; transmit, to the UE, a third configuration indicating a third SCS associated with a number of blind detections (BDs) of downlink control information (DCI) in the first search space and the second search space, wherein the third SCS corresponds to one of the first SCS or the second SCS; and transmit, to the UE, DCI in at least one of the first search space or the second search space based on the number of BDs of DCI.

[0012] According to another aspect of the disclosure, a non-transitory computer-readable medium having program code recorded thereon, the program code comprising: code for causing a user equipment (UE) to receive, from a base station (BS), a first configuration for scheduling in a first cell, wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first subcarrier spacing (SCS); code for causing the UE to receive, from the BS, a second configuration for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS; code for causing the UE to determine a number of blind detections (BDs) based on at least one of the first SCS or the second SCS; and code for monitoring for downlink control information (DCI) in the first search space and the second search space based on the number of BDs.

[0013] According to another aspect of the disclosure, a non-transitory computer-readable medium having program code recorded thereon, the program code comprising: code for causing a base station (BS) to transmit, to a user equipment (UE), a first configuration for scheduling in a first cell, wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first subcarrier spacing (SCS); code for causing the BS to transmit, to the UE, a second configuration for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS; code for causing the BS to transmit, to the UE, a third configuration indicating a third SCS associated with a number of blind detections (BDs) of downlink control information (DCI) in the first search space and the second search space, wherein the third SCS corresponds to one of the first SCS or the second SCS; and code for causing the BS to transmit, to the UE, the DCI in at least one of the first search space or the second search space based on the number of DCI BDs.

[0014] According to another aspect of the disclosure, a UE includes means for receiving, from a base station (BS), a first configuration for scheduling in a first cell, wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first subcarrier spacing (SCS); means for receiving, from the BS, a second configuration for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS; means for determining a number of blind detections (BDs) based on at least one of the first SCS or the second SCS; and means for monitoring for downlink control information (DCI) in the first search space and the second search space based on the number of BDs.

[0015] According to another aspect of the disclosure, a BS includes means for transmitting, to a user equipment (UE), a first configuration for scheduling in a first cell, wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first subcarrier spacing (SCS); means for transmitting, to the UE, a second configuration for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS; means for transmitting, to the UE, a third configuration indicating a third SCS associated with a number of blind detections (BDs) of downlink control information (DCI) in the first search space and the second search space, wherein the third SCS corresponds to one of the first SCS or the second SCS; and means for transmitting, to the UE, the DCI in at least one of the first search space or the second search space based on the number of BDs of DCI.

[0016] Other aspects, features, and embodiments of the application will become apparent to those of ordinary skill in the art, upon reviewing the following description of specific, exemplary embodiments of the present disclosure in conjunction with the accompanying figures. While features of the present application are discussed relative to certain embodiments and figures below, one of ordinary skill in the art will appreciate that all embodiments of the present application can include one or more of the advantageous features discussed herein. In other words, while one or more embodiments are discussed as having certain advantageous features, one of ordinary skill in the art will understand that the various features examined herein can be used alone or in any combination. In an analogous manner, while exemplary embodiments are discussed below as device, system or method embodiments, it is to be understood that such exemplary embodiments can be implemented in various devices, systems, and methods. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A wireless communication network according to some aspects of the disclosure is shown.

[0018] Figure 2 A radio frame structure is shown in accordance with some aspects of the present disclosure.

[0019] Figure 3 A common control resource set (CORESET) blind detection scheme is shown in accordance with some aspects of the present disclosure.

[0020] Figure 4 A cross-carrier scheduling scheme is shown in accordance with some aspects of the present disclosure.

[0021] Figure 5A is a timing diagram illustrating a control channel monitoring scheme in accordance with some aspects of the present disclosure.

[0022] Figure 5B A radio resource control (RRC) information element indicating a search space configuration is shown in accordance with some aspects of the present disclosure.

[0023] Figure 6 A cross-carrier scheduling scheme is shown in accordance with some aspects of the present disclosure.

[0024] Figure 7 A cross-carrier scheduling scheme is shown in accordance with some aspects of the present disclosure.

[0025] Figure 8A A cross-carrier scheduling scheme is shown in accordance with some aspects of the present disclosure.

[0026] Figure 8B A cross-carrier scheduling scheme is shown in accordance with some aspects of the present disclosure.

[0027] Figure 9 A control channel information monitoring scheme is shown in accordance with some aspects of the present disclosure.

[0028] Figure 10 A control channel information monitoring scheme is shown in accordance with some aspects of the present disclosure.

[0029] Figure 11 is a block diagram of an exemplary base station (BS) in accordance with some aspects of the present disclosure.

[0030] Figure 12 is a block diagram of an exemplary user equipment (UE) in accordance with some aspects of the present disclosure.

[0031] Figure 13 is a signaling diagram illustrating a cross-carrier scheduling method in accordance with some aspects of the present disclosure.

[0032] Figure 14 is a flow diagram of a wireless communication method in accordance with some aspects of the present disclosure.

[0033] Figure 15 FIG. 9 is a flow diagram of a method of wireless communication in accordance with some aspects of the present disclosure. DETAILED DESCRIPTION

[0034] The detailed description set forth below, in connection with the appended drawings and embodiments described herinin, is intended as a description of various configurations and is not intended to limit the concepts described herein to the precise construction described in connection with the embodiments disclosed herein. As discussed in detail below, various configurations can be implemented in connection with the concepts described herein. There is utility in developing these concepts and other ideas in light of the present disclosure, and the claimed concepts, and their equivalents, in which like numerals refer to similar components throughout the several views. Certain

[0035] This disclosure relates generally to wireless communication systems, also referred to as wireless communications networks. In various embodiments, the techniques and apparatus can be used in a wireless communication network such as a Code Division Multiple Access (CDMA) network, a Time Division Multiple Access (TDMA) network, a Frequency Division Multiple Access (FDMA) network, an Orthogonal FDMA (OFDMA) network, a Single-Carrier FDMA (SC-FDMA) network, a Long Term Evolution (LTE) network, a Global System for Mobile Communications (GSM) network, a 5thGeneration (5G) or new radio (NR) network, as well as other communications networks. As used herein, the terms“network” and“system” can be used interchangeably.

[0036] An OFDMA network can implement a radio technology such as evolved UTRA (E- UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11, IEEE 802.16, IEEE 802.20, Flash-OFDMA, etc. UTRA, E-UTRA, and GSM are part of universal mobile telecommunication system (UMTS). In particular, long term evolution (LTE) is a release of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS and LTE are described in documents from the organization named “3rd Generation Partnership Project” (3GPP) and cdma2000 is described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2). These various radio technologies and standards are known or are being developed. For example, the 3rd Generation Partnership Project (3GPP) is a collaboration between groups of telecommunications associations that aims to define a global standard for the third generation (3G) mobile phone

[0037] In particular, 5G networks contemplate diverse deployment scenarios, diverse spectrum, and diverse services and devices. To achieve these goals, further enhancements to LTE and LTE- A are considered in addition to development of new radio technology for 5G NR networks. 5G NR will be capable of scaling to deliver extreme mobile broadband and ultra-low latency 2 2

[0038] ​​A 5G NR communications system can be implemented to use an optimized OFDM- based waveform with scalable numerology and transmission time intervals (TTIs). Additional features can also include a common, flexible framework to efficiently multiplex services and functions with dynamic, low-latency time division duplex (TDD) / frequency division duplex (FDD) design, and advanced wireless technologies, such as massive multiple input, multiple output (MIMO), robust millimeter wave (mmWave) transmissions, advanced channel coding, and device-centric mobility. Scalability of the numerology in 5G NR has an extension of subcarrier spacing that can efficiently address operation for various services across diverse spectrum and diverse deployments. For example, in various outdoor and macro coverage deployments of sub-3 GHz FDD / TDD implementations, subcarrier spacing can occur at 15 kHz, for example, over 5, 10, 20 MHz, and so on bandwidths (BW). For other various outdoor and small cell coverage TDD deployments greater than 3 GHz, subcarrier spacing can occur at 30 kHz over 80 / 100 MHz BW. For other various indoor wideband implementations using TDD over the unlicensed portion of the 5 GHz band, subcarrier spacing can occur at 60 kHz over 160 MHz BW. Finally, for various deployments transmitting with mmWave components at 28 GHz in TDD, subcarrier spacing can occur at 120 kHz over 500 MHz BW.

[0039] The scalable numerology of 5G NR facilitates implementation of scalable TTIs to meet various latency and quality of service (QoS) requirements. For example, shorter TTIs can be used for low latency and high reliability, while longer TTIs can be used for higher spectral efficiency. Efficient multiplexing of long and short TTIs allows transmissions to start at symbol boundaries. 5G NR also envisions a self-contained, integrated subframe design with UL / downlink scheduling information, data, and acknowledgement in the same subframe. This self-contained, integrated subframe supports communications in unlicensed or contention-based shared spectrum, adaptive UL / downlink, which can be flexibly configured on a per-cell basis to dynamically switch between UL and downlink to meet current traffic demands.

[0040] Various other aspects and features of the disclosure are further described below. It should be apparent that the teachings herein can be embodied in a wide variety of forms and that any specific structure, function, or both being disclosed herein is merely representative and not limiting. Based on the teachings herein one of an ordinary level of skill in the art should appreciate that a variety of further aspects and features can be derived from the described aspects that are within the scope of the present disclosure. For example, an apparatus can be implemented or a method can be practiced using any number of the aspects set forth herein. In addition, such an apparatus can be implemented or such a method can be practiced using other structure, functionality, or structure and functionality in addition to or other than one or more of the aspects set forth herein. For example, a method can be implemented as part of a system, device, apparatus, and / or as instructions stored on a computer readable medium for execution on a processor or computer. Furthermore, an aspect can comprise at least one of the enumerated elements.

[0041] In a wireless communication network, a BS can schedule a UE for UL and / or DL communication by transmitting UL and / or DL scheduling grants to the UE, respectively. The UL and / or DL scheduling grants can be in the form of downlink control information (DCI). The BS can configure a search space (a time-frequency resource region) for the UE in which the BS can transmit the UL and / or DL scheduling grants. Thus, the UE can monitor the search space for the UL and / or DL scheduling grants from the BS. In some aspects, the BS can transmit DCI in the search space using various resource combinations (e.g., including control channel element (CCE) arrangements and / or aggregation levels (ALs)) in the search space, and the UE can detect the DCI based on performing blind decodes in the search space based on these resource configurations. For example, a number of blind decodes that the UE can perform in the search space can correspond to a number of potential combinations that the BS can use to transmit DCI in the search space. In some examples, the search space can be repeated in time according to a certain periodicity. The BS can configure the UE with a monitoring configuration, for example, including DCI monitoring occasions corresponding to time locations of the search space, a monitoring periodicity corresponding to a search space periodicity, and / or a number of blind decodes corresponding to a number of potential combinations of resources.

[0042] To transmit data at higher rates, UEs and BSs can communicate in parallel on multiple frequency bands (a form of carrier aggregation (CA)). In this configuration, one of the frequency bands can be associated with a primary cell (Pcell) and another frequency band is associated with a secondary cell (Scell). One or more of the Pcell or Scell can function as a scheduling cell in which the BS can transmit control channel information indicating scheduling grants or resource allocations (locations of DL / UL data resources) in another cell, referred to as a scheduled cell. In one example, a UE can monitor for DCI on a scheduling cell, where the DCI indicates that downlink data (e.g., transmitted in a PDSCH) will be scheduled or transmitted on a scheduled cell. This can be referred to as “cross-carrier scheduling.” In addition, the UE can also monitor for DCI on the scheduling cell for self-scheduling of DL data on the scheduling cell.

[0043] As used herein, the term “cross-carrier scheduling” can refer to a BS transmitting a scheduling grant (DCI) in one cell for scheduling in another cell. As used herein, the term “self-scheduling” can refer to a BS transmitting a scheduling grant (DCI) in a cell for scheduling in that same cell. As used herein, the term “scheduling cell” can refer to a cell in which scheduling is communicated. As used herein, the term “scheduled cell” can refer to a cell in which UL and DL communications are scheduled. As used herein, the terms “search space” and “search space set” refer to a set of DCI candidates or physical downlink control channel (PDCCH) candidates that a UE can monitor for scheduling grants (e.g., DCI). As used herein, the term “number of blind decodes (BDs)” refers to a number of PDCCH candidates that a UE can monitor in a search space, and the “number of blind decodes (BDs)” can be associated with a number of non-overlapping control channel elements (CCEs) in a search space.

[0044] In 5G NR, a scheduling cell and a scheduled cell can be associated with different subcarrier spacings (SCSs). For example, if a Scell is a scheduling cell, the scheduling cell / Scell can have a 30 kHz SCS and the scheduled cell / Pcell can have a 15 kHz SCS. A monitoring configuration (e.g., monitoring occasion periodicity, number of blind decodes) that a UE uses to identify DCI can be based on the SCS of the scheduling cell. When a CA system utilizes cross-carrier scheduling with a single scheduling cell, a search space and / or DCI monitoring can be configured based on the SCS of the scheduling cell. For example, a Pcell in a CA system can be a scheduling cell that provides scheduling for the Pcell and one or more Scells in the CA system.

[0045] In some cases, it can be desirable to offload some scheduling operations to a Scell to alleviate traffic load in a Pcell. However, the Pcell is typically used as an anchor cell to deliver system information. Thus, the Pcell can also transmit scheduling information for communications in the Pcell. In other words, communications in the Pcell (scheduled cell) can be based on scheduling transmitted in the Pcell and / or Scell. Thus, a UE can monitor for DCI in the Pcell as well as in the Scell to obtain scheduling for communications within the Pcell. As described above, the number of BDs performed by the UE in DCI monitoring (the number of PDCCH candidates monitored by the UE) can depend on the SCS of the scheduling cell. However, since DL / UL transmissions on a cell can be scheduled by two or more different cells associated with two or more different SCSs, the UE can not know which SCS to use to determine the number of BDs for monitoring in the scheduling cell. Thus, if the BS transmits DCI such that it can be successfully decoded using a number of BDs associated with the SCS of a first scheduling cell rather than a number of BDs associated with the SCS of a second scheduling cell, the UE can not be able to decode the DCI without exceeding certain BD and / or CCE budgets, which are associated with, for example, the capabilities of the UE.

[0046] Aspects of the disclosure provide mechanisms for monitoring control channel information (e.g., DCI) by performing a number of BDs, where the number of BDs is determined based on an SCS associated with at least one scheduling cell. For example, a UE can be configured to determine the number of BDs based on a lower SCS or a higher SCS of the SCS of the scheduling cell. In another aspect, the UE is configured to determine the number of BDs based on an SCS explicitly configured in RRC signaling. By configuring the UE to determine the number of BDs based on a selected one of the SCS of the scheduling cell, the UE can monitor for DCI on scheduling cells having different SCSs and ensure that the DCI can be successfully decoded or detected within the determined BD and / or CCE limits.

[0047] Figure 1 A wireless communication network 100 according to some aspects of the disclosure is shown. The network 100 can be a 5G network. The network 100 includes a plurality of base stations (BSs) 105 (labeled as 105a, 105b, 105c, 105d, 105e, and 105f) and other network entities. A BS 105 can be a station that communicates with UEs 115 and can also be referred to as an evolved node B (eNB), a next generation eNB (gNB), an access point, and the like. Each BS 105 can provide communication coverage for a particular geographic area. In 3GPP, the term “cell” is used to refer to a particular geographic coverage area of a BS 105 and / or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0048] The BSs 105 can provide communication coverage for a particular geographic area and can be referred to as a base station for that area. The base stations 105 can be macro cells (high power cellular access points) or small cells (low power cellular access points) or a combination of both. A macro cell can cover a relatively large geographic area (e.g., several kilometers in radius) and can allow for reception of data signals at very high speed. A small cell can cover a relatively small geographic area and can allow for reception of data signals at a lower speed than a macro cell. For example, a small cell can be implemented as a femto cell, a pico cell, or a micro cell. A base station 105 can be owned and / or operated by the same or different service providers. The base stations 105 can use different radio access technologies (RATs) to communicate with the UEs 115. For example, some base stations 105 can use a 5G RAT, such as a 5G New Radio (NR) RAT, while other base stations 105 can use a Long Term Evolution (LTE) RAT, a Global System for Mobile Communications (GSM) RAT, or some other RAT. Figure 1 In the example shown, the BSs 105d and 105e can be regular macro BSs, while the BSs 105a- 105c can be macro BSs with one of three-dimensional (3D), full-dimension (FD), or massive MIMO capabilities. The BSs 105a-105c can utilize their higher dimensional MIMO capabilities to increase coverage and capacity in azimuth and elevation beamforming. The BS 105f can be a small cell BS, which can be a home node or a portable access point. A BS can be referred to as a BS, a Node-B, an eNode-B, a gNode-B, or some other similar terminology, as appropriate.

[0049] The network 100 can support synchronous or asynchronous operation. For synchronous operation, the BSs can have similar frame timing, and transmissions from different BSs can be approximately aligned in time. For asynchronous operation, the BSs can have different frame timing, and transmissions from different BSs can not be aligned in time.

[0050] The UEs 115 are dispersed throughout the wireless network 100, and each UE 115 can be stationary or mobile. A UE 115 can also be referred to as a terminal, a mobile station, a subscriber unit, a station, etc. A UE 115 can be a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wireless local loop (WLL) station, etc. In one aspect, a UE 115 can be a device that includes a Universal Integrated Circuit Card (UICC). In another aspect, a UE can be a device that does not include a UICC. In some aspects, UEs 115 that do not include UICCs can also be referred to as IoT devices or Internet of Everything (IoE) devices. UEs 115a-115d are examples of mobile smart phone-type devices accessing network 100 A UE 115 can also be a machine specifically configured to connect to a network, including a machine type communication (MTC), enhanced MTC (eMTC), narrowband IoT (NB-IoT) and the like. UEs 115e-l 15h are examples of various machines configured to access the network 100 configured to access the network 100 configured to access the network 100 configured to access the network 100 configured to access the network 100. UEs 115i-l 15k are examples of vehicles configured with wireless communication devices configured to implement communication access to network 100. A UE 115 can be able to communicate with any type of the BSs, whether macro BS, small cell, or the like. In Figure 1 In general, a lightning bolt (e.g., a communication link) indicates a wireless transmission between a UE 115 and a serving BS 105 that is designated to serve the UE 115 on the downlink (DL) and / or uplink (UL), an intended transmission between BSs 105, a backhaul transmission between BSs, or a sidelink transmission between UEs 115.

[0051] In operation, BSs 105a- 105c can serve the UE 115a and the UE 115b using 3D beamforming and coordinated spatial techniques such as coordinated multipoint (CoMP) or multi-connectivity. Macro BS 105d can perform backhaul communications with BSs 105a- 105c, as well as small cell BS 105f. Macro BS 105d can also transmit a multicast service that is subscribed to and received by UEs 115c and 115d. Such a multicast service can include mobile television or stream video, or can include other services, for example weather emergency or alerts (such as amber or gray alerts).

[0052] The BSs 105 can also communicate with a core network. The core network can provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. At least some of the BSs 105 (e.g., which can be an example of gNBs or access node controllers (ANCs)) can interface with the core network through backhaul links (e.g., NG-C, NG-U, etc.) and can perform radio

[0053] The network 100 can also support mission critical communications with ultra-reliable, redundant links for devices such as UE 115e, which can be an unmanned drone. Redundant communication links with the UE 115e can include links from macro BS 105d and BS 105e, as well as links from the small cell BS 105f. Other machine type devices, such as the UE 115f (a thermometer), UE 115g (a smart meter), and UE 115h (a wearable device) can communicate through the network 100 either directly with BSs, e.g., small cell BS 105f and macro BS 105e, or in multi-step-size configurations by communicating with another user device which relays its information to the network, e.g., the temperature UE 115f communicates to the smart meter UE 115g which then relays the temperature measurement to the network through the small cell BS 105f. The network 100 can also provide additional network efficiency through dynamic, low-latency TDD / FDD communications, e.g., V2V, V2X, C-V2X between UEs 115i, 115j, or 115k and other UEs 115, and / or vehicle-to-infrastructure (V2I) communications between UEs 115i, 115j, or 115k and BS 105.

[0054] In some implementations, the network 100 communicates utilizing OFDM-based waveforms. An OFDM-based system can partition the system BW into multiple (K) orthogonal subcarriers, which are also commonly referred to as subcarriers, tones, bins, or the like. Each subcarrier can be modulated with data. In some instances, the subcarrier spacing can be fixed, and the total number of subcarriers K can be dependent on the system BW. The system BW can also be partitioned into subbands. In other instances, the subcarrier spacing and / or the duration of TTIs can be scalable.

[0055] In some aspects, the BSs 105 can assign or schedule transmission resources (e.g., in the form of time-frequency resource blocks (RBs)) for downlink (DL) and uplink (UL) transmissions in the network 100. DL refers to the transmission direction from a BS 105 to a UE 115, whereas UL refers to the transmission direction from a UE 115 to a BS 105. The communication can be in the form of radio frames. A radio frame can be divided into multiple subframes or slots (e.g., about 10). Each slot can be further divided into mini-slots. In FDD mode, simultaneous UL and DL transmissions can occur in different frequency bands. For example, each subframe includes a UL subframe in a UL frequency band and a DL subframe in a DL frequency band. In TDD mode, UL and DL transmissions occur at different time periods using the same frequency band. For example, one subset of subframes (e.g., DL subframes) in a radio frame can be used for DL transmissions, and another subset of subframes (e.g., UL subframes) in the radio frame can be used for UL transmissions.

[0056] A DL subframe and an UL subframe can be further divided into several regions. For example, each DL or UL subframe can have pre-defined regions for transmissions of reference signals, control information, and data. Reference signals are predetermined signals that facilitate the communications between the BSs 105 and the UEs 115. For example, a reference signal can have a particular pilot pattern or structure, where pilot tones can span an operational BW or frequency band, each positioned at a pre-defined time and a pre-defined frequency. For example, a BS 105 can transmit cell-specific reference signals (CRSs) and / or channel state information - reference signals (CSI-RSs) to enable a UE 115 to estimate a DL channel. Similarly, a UE 115 can transmit sounding reference signals (SRSs) to enable a BS 105 to estimate a UL channel. Control information can include resource assignments and protocol

[0057] In some aspects, the network 100 can be an NR network deployed over a licensed spectrum. The BSs 105 can transmit synchronization signals (e.g., including a primary synchronization signal (PSS) and a secondary synchronization signal (SSS)) in the network 100 to facilitate synchronization. The BSs 105 can broadcast system information associated with the network 100 (e.g., including a master information block (MIB), remaining system information (RMSI), and other system information (OSI)) to facilitate initial network access. In some instances, the BSs 105 can broadcast the PSS, the SSS, and / or the MIB in the form of synchronization signal blocks (SSBs) over a physical broadcast channel (PBCH) and can broadcast the RMSI and / or the OSI over a physical downlink shared channel (PDSCH).

[0058] In some aspects, a UE 115 attempting to access the network 100 can perform an initial cell search by detecting a PSS from a BS 105. The PSS can enable synchronization of periodic timing and can indicate a physical layer identification value. The UE 115 can then receive an SSS. The SSS can enable radio frame synchronization and can provide a cell identification value, which can be combined with the physical layer identification value to identify the cell. The PSS and the SSS can be located in the center portion of a carrier, or can be anywhere in the carrier as appropriate.

[0059] After receiving the PSS and the SSS, the UE 115 can receive a MIB. The MIB can include system information for initial network access and scheduling information for RMSI and / or OSI. After decoding the MIB, the UE 115 can receive the RMSI and / or the OSI. The RMSI and / or the OSI can include radio resource control (RRC) information related to random access channel (RACH) procedures, paging, control resource sets (CORESETs) for physical downlink control channel (PDCCH) monitoring, physical UL control channel (PUCCH), physical UL shared channel (PUSCH), power control, and SRS.

[0060] After obtaining the MIB, the RMSI, and / or the OSI, the UE 115 can perform a random access procedure to establish a connection with the BS 105. In some examples, the random access procedure can be a four-step random access procedure. For example, the UE 115 can transmit a random access preamble and the BS 105 can respond with a random access response. The random access response (RAR) can include a detected random access preamble identifier (ID) corresponding to the random access preamble, timing advance (TA) information, a UL grant, a temporary cell radio network temporary identifier (C-RNTI), and / or a backoff indicator. Upon receiving the random access response, the UE 115 can transmit a connection request to the BS 105 and the BS 105 can respond with a connection response. The connection response can indicate a contention resolution. In some examples, the random access preamble, the RAR, the connection request, and the connection response can be referred to as message 1 (MSG1), message 2 (MSG2), message 3 (MSG3), and message 4 (MSG4), respectively. In some examples, the random access procedure can be a two-step random access procedure in which the UE 115 can transmit a random access preamble and a connection request in a single transmission, and the BS 105 can respond by transmitting a random access response and a connection response in a single transmission.

[0061] After establishing a connection, the UE 115 and the BS 105 can enter a normal operations phase where operational data can be exchanged. For example, the BS 105 can schedule the UE 115 for UL and / or DL communications. The BS 105 can transmit UL and / or DL scheduling grants to the UE 115 via PDCCH. The scheduling grants can be transmitted in the form of DL control information (DCI). The BS 105 can transmit DL communication signals (e.g., carrying data) to the UE 115 via PDSCH in accordance with the DL scheduling grants. The UE 115 can transmit UL communication signals to the BS 105 via PUSCH and / or PUCCH in accordance with the UL scheduling grants.

[0062] In some aspects, the network 100 can operate over a system BW or a component carrier (CC) BW. The network 100 can partition the system BW into multiple BWPs (e.g., portions). The BS 105 can dynamically assign the UE 115 to operate over a certain BWP (e.g., a certain portion of the system BW). The assigned BWP can be referred to as the active BWP. The UE 115 can monitor the active BWP for signaling information from the BS 105. The BS 105 can schedule the UE 115 for UL or DL communications in the active BWP. In some aspects, the BS 105 can assign a pair of BWPs within a CC to the UE 115 for UL and DL communications. For example, the pair of BWPs can include one BWP for UL communications and one BWP for DL communications.

[0063] In some respects, network 100 may be an NR network that supports carrier aggregation (CA) of component carriers (CCs) associated with various subcarrier spacings (SCS). Network 100 may also support dynamic spectrum sharing (DSS) and cross-carrier scheduling between serving cells with different SCSs.

[0064] Figure 2 A radio frame structure 200 according to some aspects of this disclosure is shown. A BS such as BS105 and a UE such as UE115 in a network such as network 100 can communicate using radio frame structure 200. Specifically, the BS can communicate with the UE using time-frequency resources configured as shown in radio frame structure 200. Figure 2 In this diagram, the x-axis represents time in some arbitrary unit, and the y-axis represents frequency in some arbitrary unit. The transmission frame structure 200 includes a radio frame 201. The duration of the radio frame 201 can vary depending on various factors. In one example, the radio frame 201 may have a duration of approximately ten milliseconds. The radio frame 201 includes M time slots 202, where M can be any suitable positive integer. In one example, M may be approximately 10.

[0065] Each time slot 202 includes multiple subcarriers 204 in frequency and multiple symbols 206 in time. The number of subcarriers 204 and / or symbols 206 in time slot 202 can vary depending on various factors (e.g., based on channel BW, subcarrier spacing (SCS), and / or CP mode). One subcarrier 204 in frequency and one symbol 206 in time form a resource element (RE) 212 for transmission. Multiple consecutive subcarriers 204 in frequency and multiple subsymbols 206 in time form a resource block (RB) 210.

[0066] In one example, BS (e.g., Figure 1 The BS105 in the middle can schedule the UE (e.g., according to the time granularity of time slot 202 or micro time slot 208) Figure 1The BSs 105 can also utilize beamforming to transmit reference signals and / or channel state information (CSI) requests to the UEs 115. The UEs 115 can then transmit CSI reports in response to the received CSI requests. In some aspects, the UEs 115 can transmit the CSI reports using the beamformed reference signals. The UEs 115 can also utilize beamforming to transmit SRS to the BSs 105. The SRS can be used by the BSs 105 to determine the channel

[0067] Figure 3 A common CORESET configuration scheme 300 is shown in accordance with some aspects of the disclosure. BSs, such as the BSs 105, and UEs, such as the UEs 115, in a network, such as the network 100, can employ the scheme 300 for communication. In particular, the BSs can transmit PDCCH to the UEs using time-frequency resources configured as shown in the scheme 300. The x-axis represents time in some arbitrary units, while the y-axis represents frequency in some arbitrary units.

[0068] A CORESET is a set of physical time-frequency resources in which a BS (e.g., the BS 105) can transmit PDCCH to provide scheduling information and / or any DL control information to a UE (e.g., the UE 115) in a network (e.g., the network 100). With reference to Figure 2 and Figure 3 A CORESET can span, in frequency, a multiple of, for example, six RBs (e.g., the RBs 210) in a non-contiguous or contiguous group, and, in time, a multiple of between one and three consecutive OFDM symbols (e.g., the symbols 206). In the time domain, the duration of a CORESET can be up to three OFDM symbols and located at any position within a slot (e.g., at the beginning of a slot). In the frequency domain, a CORESET can be defined as a multiple of six RBs up to the system carrier frequency BW (e.g., the channel frequency BW).

[0069] With reference to Figure 3CORESET 301 includes sixteen CCEs 312. The CCEs 312 can be indexed from 0 to 15 (shown as CCE1 to CCE15). The CORESET 301 is CORESET #0. Each CCE 312 includes six resource element groups (REGs), where a REG is defined as one physical RB in one symbol. In some aspects, the CORESET 301 can span 96 RBs (e.g., RBs 210), with a SCS of 15 kHz in frequency and one symbol in time (e.g., symbol 206). In other words, each CCE 312 can span 6 RBs in frequency and one symbol in time. In some other aspects, the CORESET 301 can span 48 RBs, with a SCS of 30 kHz in frequency and two symbols in time. In other words, each CCE 312 can span 3 RBs in frequency and two symbols in time.

[0070] The BS (e.g., BS 105) can transmit an RRC information element (e.g., MIB, SIB scheduling) using an aggregation of four CCEs 312, an aggregation of eight CCEs 312, or an aggregation of sixteen CCEs 312, the RRC information element including a search configuration of a PDCCH search space 314 associated with the CORESET 301. A PDDCH search space is an instance of a CORESET in a certain slot. The aggregation of four CCEs 312 can be referred to as an aggregation level (AL) of 4. The aggregation of eight CCEs 312 can be referred to as an AL of 8. The aggregation of sixteen CCEs 312 can be referred to as an AL of 16. The higher the AL, the more redundancy and more frequency diversity the PDCCH transmission can provide, and thus the more robust the PDCCH transmission can be. A UE (e.g., UE 115) can monitor the search space 314 by performing blind decodes to search for PDCCH candidates in the search space 314 based on an aggregation level (AL) of 4, 8, or 16. The PDCCH monitoring for SIB scheduling is PDCCH TypeO monitoring. In some aspects, as part of PDCCH blind decoding, the UE can decode one candidate at an AL of 16, two candidates at an AL of 8, and four candidates at an AL of 4 in the PDCCH search space. In some aspects, the PDCCH candidates in the CORESET 301 are mapped to the CCEs 312 as follows:

[0071]

[0072] where N CcE represents the number of CCEs 312 in the CORESET 301, L represents the AL, i can vary from 0 to L-1, The maximum number of PDCCH candidates representing a certain AL. According to Equation (1), the two candidates 304 are mapped to CCEs 312 indexed 0 through 7 and CCEs 312 indexed 8 through 15, and the four candidates 306 are mapped to CCEs 312 indexed 0 through 3, CCEs 312 indexed 4 through 7, CCEs 312 indexed 8 through 11, and CCEs 312 indexed 12 through 15.

[0073] Figure 4 is a diagram of a cross-carrier scheduling scheme 400 performed by a BS 405 and a UE 415. The BS 405 can be one of the BSs 105 and the UE 415 can be one of the UEs 115 in the network 100. The BS 405 and the UE 415 communicate using a carrier aggregation (CA) scheme such that the UE 415 can receive DL data and / or transmit UL data on two different serving cells (a first cell 410a and a second cell 410b). In Figure 4In the example, the first cell 410a is a primary cell (Pcell) and the second cell 410b is a secondary cell (Scell), where the Pcell and Scell are different frequency carriers. The BS 405 can schedule the UE 415 via the first cell 410a for communication in the first cell 410a (self-scheduling). The BS 405 can also schedule the UE 415 via the second cell 410b for communication in the first cell 410a (cross-carrier scheduling). For example, the BS 405 can configure one or more DCI search spaces (including PDCCH candidates similar to the search space 314) in each of the first cell 410a and the second cell 410b. For example, the BS 405 can configure a search space configuration for each search space for the UE. In the illustrated example, the BS 405 can configure the UE 415 with a common search space (including PDCCH candidates similar to the search space 314) in the first cell 410a and two UE-specific search spaces (including PDCCH candidates) in the second cell 410b. The common search space can refer to a search space for monitoring by a group of UEs. The UE-specific search space can refer to a search space for monitoring by a particular UE. For example, the BS 405 can configure the UE 415 with a common search space configuration 412 for monitoring the common search space in the first cell 410a and UE-specific search space configurations 416 for monitoring the UE-specific search spaces in the second cell 410b. Thus, the UE 415 monitors for DCI in each of the first cell 410a and the second cell 410b using the respective search space configurations 412, 414, 416. The first cell 410a and the second cell 410b are associated with respective carrier indicator fields (CIFs) (e.g., CIF = 1 for the first cell 410a and CIF = 0 for the second cell 410b). In the first cell 410a, the UE 415 monitors for DCI by attempting to decode one or more PDCCH candidates using the common search space configuration 412. The UE 415 can be configured for the common search space configuration of the first cell 410a by receiving an RRC information element (e.g., SIB) from the BS 405 indicating the common search space configuration 412. The BS 405 can determine the common search space configuration 412 based on a SCS of the first cell 410a. In the illustrated example, the SCS of the first cell 410a can be 15 kHz. As will be further explained below, a search space configuration used by the UE 415 can indicate a monitoring occasion periodicity, a duration of a monitoring occasion, a monitoring occasion offset, or any other appropriate monitoring parameter. Thus, the UE 415 can monitor for DCI in the search space in the first cell 410a based on the parameters of the common search space configuration 412.In response to identifying / decoding the DCI, the UE 415 can detect DL data and / or schedule UL data (data transmission 422) on the first cell 410a based on the scheduling information provided in the DCI. In some aspects, the DCI for cross-carrier scheduling can include UL or DL communication scheduling and a CIF to indicate the cell (or carrier) in which the communication is being scheduled.

[0074] The UE 415 also monitors for DCI in the second cell 410b. The UE 415 is configured with two UE-specific search space configurations 414, 416 for the second cell 410b. One or both of the UE-specific search space configurations 414, 416 can be associated with the SCS of the second cell 410b. In the example shown, the SCS of the second cell 410b can be 30 kHz. The first UE-specific search space configuration 414 for the Pcell (CIF = 1) includes a first set of monitoring parameters, such as a monitoring occasion periodicity, a duration of a monitoring occasion, a monitoring occasion offset, or any other appropriate monitoring parameters. The UE 415 monitors for DCI in a first search space (configured by configuration 414) within the second cell 410b based on the parameters of the first UE-specific search space configuration 414. In response to identifying / decoding the DCI, the UE 415 can receive DL data and / or transmit UL data (data transmission 422) in the first cell 410a based on the scheduling information provided in the DCI. Thus, it should be understood that the data transmission 422 can potentially be scheduled by the Pcell 410a or the Scell 410b.

[0075] The second UE-specific search space configuration 416 for the Scell (CIF = 0) includes a second set of monitoring parameters, such as a monitoring occasion periodicity, a duration of a monitoring occasion, a monitoring occasion offset, or any other appropriate monitoring parameters. The UE 415 monitors for DCI in a second search space (configured by configuration 416) within the second cell 410b based on the parameters of the second UE-specific search space configuration 416. In response to identifying / decoding the DCI, the UE 415 can receive DL data (e.g., data transmission 424) and / or transmit UL data (e.g., data transmission 422) in the second cell 410b based on the scheduling information provided in the DCI. Thus, the UE 415 can monitor for DCI associated with the same serving cell and / or a different serving cell (e.g., the Pcell 410a) in one serving cell (e.g., the Scell 410b). In some aspects, UL resources can be available on the Pcell 410a but not on the Scell 410b. Further, in some aspects, DL data can be scheduled on both the Pcell 410a and the Scell 410b.

[0076] Figure 5A and 5BSearch space configurations are shown in accordance with some aspects of the disclosure. In particular, Figure 5A is a timing diagram illustrating a DCI monitoring scheme 500 using search space configurations, Figure 5B Assemblies of an RRC information element 550 including search space configurations 560 are shown. UEs such as the UEs 115, 415 in a network such as the network 100 can communicate using the scheme 500. The scheme 500 is performed based on parameters of the search space configurations 560.

[0077] Reference is made to Figure 5A The DCI monitoring scheme 500 includes a UE (e.g., the UE 115 or the UE 415) periodically monitoring PDCCH candidates from a BS (e.g., one of the BSs 105, 405) within a search space 502 (shown as 502a and 502b). The search spaces 502a and 502b can correspond to search spaces (e.g., the search space 314) associated with a CORESET (e.g., the CORESET 301) that is repeated in time. For example, the search spaces 502a, 502b are based on various periodicity and timing parameters, including a slot periodicity 506, a slot offset 514, a starting symbol 512, and other parameters. In the illustrated embodiment, the DCI monitoring scheme 500 is configured with a slot offset 514 that is offset by 1 slot from a reference time 501 (e.g., the beginning of the radio frame 201). The slots 504 can be indexed (e.g., from 0 to 9, from 0 to 19). The first search space 502a occurs in the second slot 504 with slot index 1 in a given radio frame. In some aspects, the slot offset 514 can be set based on a monitoringSlotPeriodicityAndOffset parameter 566 indicated in the search space configurations 560.

[0078] Each slot 504 includes a number of symbols 508. In Figure 5A Each slot 504 has 14 symbols with index ranging from 0 to 13. However, other configurations are possible, including slots with seven symbols, for example.

[0079] The search space 502a occurs once every N slots, where N is an integer associated with the slot periodicity 506. In some aspects, N can be 1, 2, 3, 4, 5, 7, 10, or any other suitable integer, both greater and smaller. The slot periodicity 506 can be set based on the monitoringSlotPeriodicityAndOffset parameter 566 indicated in the search space configuration 560. In some aspects, the slot periodicity 506 can be based on or associated with the SCS of the scheduling / monitoring cell. In some aspects, a serving cell with a higher SCS (e.g., 30 kHz, 120 kHz) can be configured to have a smaller slot periodicity, such that its monitoring occasions are more frequent than the monitoring occasions in a cell with a lower SCS (e.g., 15 kHz).

[0080] The search space 502a, 502b starts from a starting symbol 512 within the slot 504. The starting symbol 512 can be set based on the monitoringSymbolWithinSlot parameter 565 indicated in the search space configuration 560. In some aspects, the starting symbol 512 can be based on or associated with the SCS of the scheduling / monitoring cell.

[0081] The search space 502a, 502b can be associated with a monitoring occasion duration 510, which indicates the number of consecutive slots in which the search space 502 can exist. In some aspects, the duration 510 is N slots, where N is an integer. In the example shown, N is 1. The duration can be set as a parameter of the search space configuration 560, or based on that parameter.

[0082] In some aspects, the BS can transmit the RRC information element 550 to the UE as part of system information (e.g., in the MIB to provide SIB scheduling information), as part of an initial network access procedure, or as part of normal operation. The search space configuration 560 includes other parameters, such as a search space identifier 561, a duration 562, a CORESET ID 563, a NrOfCandidates parameter 564, and a search space type parameter 567. In some aspects, the BS can configure the UE with up to about three CORESETs and up to about ten search spaces, each instantiated from one of the CORESETs.

[0083] In some aspects, the BS can configure the UE with one active BWP for each of the Pcell or Scells at any given time. The BS can transmit a RRC message to the UE that includes a BWP configuration for communicating over, for example, a certain BWP in the Pcell. The BWP configuration can include one or more search configurations similar to search space configuration 560 that provide the UE with DCI monitoring occasions for transmissions scheduled in the BWP of the Pcell. Similarly, the BS can use similar mechanisms to configure the UE with active BWPs in the Scells.

[0084] Figure 6 A cross-carrier scheduling scheme 600 is shown in accordance with aspects of the disclosure. A UE 615, which can be one of the UEs 115, 415 in a network such as network 100, employs scheme 600 for communication. Scheme 600 can be performed based on the parameters of search space configuration 560 indicated in RRC information element 550 described above in Figure 5B Figure 6 A UE, such as one of the UEs 115 or 415, can be connected to a BS 605, which can be one of the BSs 105 or 405, via multiple serving cells. In the illustrated scenario, UE 615 is connected to BS 605 via five cells: a first cell 610, a second cell 620, a third cell 630, a fourth cell 640, and a fifth cell 650. In some aspects, each cell can be associated with a carrier indicator field (CIF) value, which in this case can range from CIF = 0 to CIF = 4. For example, first cell 610 can be a Pcell and can have a CIF of 0. Second cell 620 can be a first Scell and can have a CIF of 1. Third cell 630 can be a second Scell and can have a CIF of 2.

[0085] A cell can operate as a scheduling cell 602 and / or a scheduled cell 604. In Figure 6 In the illustrated scenario, first cell 610 and second cell 620 are scheduling cells 602. However, it should be understood that the disclosure also contemplates other configurations, such as a single scheduling cell 602 or more than two scheduling cells 602. The shading or pattern of each cell represents the SCS of that cell, as indicated by the legend. Thus, in Figure 6 ​In particular, the first cell 610 is associated with a SCS of 15 kHz, the second cell 620 and the third cell 630 are associated with a SCS of 30 kHz, and the fourth cell 640 and the fifth cell 650 are associated with a SCS of 120 kHz. Each scheduled cell 604 is scheduled by a single scheduling cell 602 among the scheduling cells 602. For example, the first cell 610 is the only scheduling cell for the first cell 610. In other words, the first cell 610 is a self-scheduling cell. Similarly, the second cell 620 is the only scheduling cell for the second cell 620. The second cell 620 is also a scheduling cell for the third cell 630 and the fifth cell 650. The first cell 610 is also a scheduling cell for the fourth cell 640.

[0086] As explained above, the UE 615 can monitor control channel information (e.g., DCI) on the scheduling cells 602. The UE 615 monitors the control channel information based on search parameters associated with each cell. Some of the search parameters can be configured by the BS 605 in a search space configuration (e.g., configuration 560 shown in FIG. 6B) in a master information block (MIB) or a system information block (SIB). Further, the UE 715 can monitor the control channel information by searching multiple PDCCH candidates or performing multiple blind decodes (BDs) to identify / decode the control channel information. Further, the search parameters can indicate a maximum number of PDCCH candidates (CCEs) per aggregation level. In one aspect, the UE 615 is expected to perform a maximum number of BDs on more than one cell or component carrier. The maximum number of BDs that the UE 615 is expected to perform on a scheduled cell (per frequency carrier) can be determined based on the following relationship: Figure 5B

[0087]

[0088] wherein, is a maximum number of BDs per slot based on a SCS configuration (μ) of a scheduling cell, is a number of scheduled cells associated with or scheduled by a scheduling cell with SCS configuration μ, is a total number of scheduled cells. Similarly, a maximum number of non-overlapping CCEs that the UE 615 can perform for a scheduled cell can be determined based on the following relationship:

[0089]

[0090] wherein, is a maximum number of CCEs per slot based on a SCS configuration (μ) of a scheduling cell, is a number of scheduled cells associated with or scheduled by a scheduling cell with SCS configuration μ, is a total number of scheduled cells. ​

[0091] In some aspects, the BS 605 configures the UE 615 such that the UE 615 can not perform more BDs for each Scell than provided by equations (2)-(5). However, in some cases, the BS can configure the UE 615 to perform more BDs than provided by equations (2)-(5) for a Pcell or P(S)cell. In such cases, the UE 615 can drop or prune some search spaces or search space sets that exceed the maximum number of BDs / CCEs.

[0092] Referring again to Figure 6 , the UE 615 can monitor for scheduling grants (e.g., DCI) of the scheduled cells 604 by performing BDs in the scheduling cell 602. The number of BDs performed by the UE 615 in monitoring for DCI is determined for each scheduled cell, but is based on the SCS (m) of the scheduling cell, and is further based on the total number of scheduled cells (e.g., corresponding to the number of cells used by the BS 605 to serve the UE 615), the number of cells scheduled by the scheduling cell, and / or the capabilities of the UE 615. Since in the scenario of Figure 6 each scheduled cell is associated with a single scheduling cell, the number of BDs performed by the UE 615 in monitoring for DCI scheduling DL / UL data transmissions on a scheduled cell can be determined based on the SCS of the scheduling cell.

[0093] As an example, each of the first cell 610 and the fourth cell 640 are scheduled by the first cell 610 having a 15 kHz SCS. In some aspects, the maximum number of BDs expected to be performed by the UE 615 for a scheduling cell having a 15 kHz SCS is 44. The total number of scheduled cells 604 is 5 (cells 610-650). The number of scheduled cells 604 scheduled by the scheduling cell 610 is 2 (cells 610 and 640). Thus, the number of BDs performed for DCI monitoring for scheduling each of the first cell 610 and the fourth cell 640 can be determined according to equations (2) and (3) by replacing the total number of scheduled cells (which is 5) and the number of scheduled cells scheduled by the cell 610 (which is 2) per slot (e.g., 1 ms slot based on 15 kHz SCS), as follows:

[0094] Min{44, R x 44 x 2 / 5}, (6)

[0095] where R can represent the number of scheduling cells that the UE 615 is capable of supporting, e.g., based on a capability report of the UE 615. When R is 2, equation (6) can be evaluated to approximately 35. In other embodiments, the UE 615 can perform up to 35 BDs per slot for each of the scheduled cells 610 and 640.

[0096] Similarly, each of the second cell 620, the third cell 630, the fifth cell 650, and the fourth cell 640 are scheduled by the second cell 620 with a SCS of 30 kHz. In some aspects, the maximum number of BDs that the UE 615 expects to perform for a scheduling cell with a SCS of 30 kHz is 35. The total number of scheduled cells 604 is 5 (cells 610-650). The number of scheduled cells 604 scheduled by the scheduling cell 620 is 3 (cells 620, 630, and 650). Thus, the number of BDs performed for DCI monitoring for each of the scheduling cells 620, 630, and 650 can be determined according to equations (2) and (3) by replacing the total number of scheduled cells, which is 5, and the number of scheduled cells scheduled by the cell 620, which is 3, per slot (e.g., 0.5 ms slot based on 30 kHz SCS), as follows:

[0097] Min{36, R x 36 x 3 / 5}, (7)

[0098] where R can represent the number of scheduling cells that the UE 615 is capable of supporting, e.g., based on a capability report of the UE 615. When R is 2, equation (7) can be evaluated to approximately 35. In other embodiments, the UE 615 can perform up to 36 BDs per slot for each of the scheduled cells 620, 630, and 650.

[0099] However, in some aspects (e.g., DSS and CA), DCI associated with a scheduled cell (e.g., Pcell) can be transmitted on more than one scheduling cell, like Pcell and Scell. Moreover, the two or more scheduling cells used to process PDCCH candidates can be associated with different SCSs. For example, DL / UL data transmission on Pcell can be self-scheduled in Pcell, or alternatively can be cross-carrier scheduled on Scell. The Pcell can have a first SCS, while the Scell can have a different second SCS. For example, the SCS of the Pcell can be 15 kHz, while the SCS of the Scell can be, for example, 30 kHz. Thus, using the relationships described above, there are two possibilities for determining the number of BDs to perform based on the two SCSs of the scheduling cells. It is desirable for the BS 605 to transmit DCI such that the UE 615 can decode the DCI within the determined number of BDs. The present disclosure describes mechanisms for determining the number of BDs to perform to monitor control channel information (e.g., DCI) in cross-carrier scheduling scenarios, particularly in cross-carrier scheduling scenarios where a UE can use more than one scheduling cell to schedule a scheduled cell. In particular, the present disclosure provides a framework for determining the number of BDs within a monitoring period of a DCI monitoring procedure based on the SCS associated with one of the scheduling cells.

[0100] Figure 7 A cross-carrier scheduling scheme 700 is shown in accordance with aspects of the present disclosure. In some aspects, the scheme 700 can be similar to the scheme 600 shown in Figure 6 In this aspect, a UE 715, which can be one of the UEs 115, 415 in a network such as the network 100, employs the scheme 700 for communication. The scheme 700 can be performed based on the parameters of the search space configuration 560 indicated in the RRC information element 550 described above in Figure 5B A UE, such as one of the UEs 115 or 415, can be connected to a BS 705, which can be one of the BSs 105 or 405, via multiple serving cells. In Figure 7 In the scenario shown, the UE 715 is connected to the BS 705 via five cells: a first cell 710, a second cell 720, a third cell 730, a fourth cell 740, and a fifth cell 750. In some aspects, each cell can be associated with a carrier indicator field (CIF) value, which in this case can range from CIF = 0 to CIF = 4. For example, the first cell 710 can be a Pcell and can have a CIF of 0. The second cell 720 can be a first Scell and can have a CIF of 1. The third cell 730 can be a second Scell and can have a CIF of 2.

[0101] As explained further below, Figure 7 The scheme 700 can be different in certain aspects from the scheme 600 shown in Figure 6 For example, Figure 7 The scheme 700 can represent a DSS scheme or other cross-carrier scheme in which one or more scheduled cells 704 can be scheduled by more than one scheduling cell 702. Moreover, one or more of the scheduled cells 704 can be scheduled by any of the multiple scheduling cells 702 associated with different SCSs. For example, the first cell 710 can be self-scheduled by the first cell 710 or, alternatively, can be scheduled by the second cell 720. In one aspect, the first cell 710 can be a Pcell and the second cell 720 can be a Scell. As indicated by the legend, the first cell 710 is associated with a SCS of 15 kHz. The second cell 720 is associated with a SCS of 30 kHz.

[0102] As explained above, the number of BDs performed by the UE 715 per monitoring period (e.g., per slot) is determined for each scheduled cell but is based on the SCS of the scheduling cell. Thus, for the first cell 710, there are two possible calculations of the number of BDs. In other words, in the relationship described above, μ has two possible values. According to aspects of the present disclosure, the UE 715 can be configured to use the same relationship described above and determine the number of BDs based on one of the SCSs of: the lower SCS of the scheduling cell, the higher SCS of the scheduling cell, or a SCS specifically configured by RRC signaling. For example, in one aspect, the UE 715 can determine the number of BDs based on the lower SCS of the two or more scheduling cells associated with a given scheduled cell. In this aspect, referring to Figure 7 , the UE 715 can determine the number of BDs for the first cell 710 based on the SCS of the first cell 710, which is the lower SCS of the two scheduling cells 710, 720. In the example shown in Figure 7 , the UE 615 can determine the number of BDs for scheduling of the cells 710 and 740 by the cell 710 based on the 15 kHz SCS used by the scheduling cell 710. When applying equations (2) and (3), the number of BDs can be evaluated as the same as equation (6) discussed above with respect to Figure 6 . Similarly, the UE 615 can determine the number of BDs for scheduling of the cells 720, 730, and 750 by the cell 720 based on the 30 kHz SCS used by the scheduling cell 720. When applying equations (2) and (3), the number of BDs can be evaluated as the same as equation (7) discussed above with respect to Figure 6 .

[0103] In another aspect, the UE 715 can determine the number of BDs based on a higher SCS of two or more scheduling cells associated with a given scheduled cell. For example, the higher SCS of the scheduling cells 710 and 720 for scheduling cells 710, 720, 730, and 740 is based on 30 kHz for cell 720. Thus, for each of the first cell 710, the second cell 720, the third cell 730, and the fifth cell 750, the number of BDs to perform for DCI monitoring can be determined according to equations (2) and (3) by replacing the total number of scheduled cells (which is 5) and the number of scheduled cells per slot (e.g., 0.5 ms slot based on 30 kHz SCS) scheduled by cell 620 (which is 4), as follows:

[0104] Min{36, R x 36 x 4 / 5}, (8)

[0105] where R can be 2 and thus equation (8) can be evaluated to approximately 36. In other embodiments, the UE 615 can perform up to 36 BDs per slot for each of the first cell 710, the second cell 720, the third cell 730, and the fifth cell 750.

[0106] Similarly, the scheduled cell 740 is scheduled by cell 710 with 15 kHz SCS, the number of BDs to perform for DCI monitoring for scheduling cell 740 can be determined according to equations (2) and (3) by replacing the total number of scheduled cells (which is 5) and the number of scheduled cells per slot (e.g., 1 ms slot based on 15 kHz SCS) scheduled by cell 710 (which is 1), as follows:

[0107] Min{44, R x 44 x 1 / 5}, (9)

[0108] where R can be 2 and thus equation (9) can be evaluated to approximately 17. In other embodiments, the UE 615 can perform up to 17 BDs per slot for cell 740.

[0109] In another aspect, the UE 715 can determine the number of BDs per slot according to an SCS explicitly configured based on RRC signaling, where the configured SCS corresponds to an SCS of one of the scheduling cells (e.g., the first cell 710, the second cell 720).

[0110] In some aspects, the SCS configurations described above can be configured by the network 100. For example, the BS 705 can be configured to transmit DCI according to an SCS selection configuration (e.g., higher SCS / lower SCS) configured on the UE 715 for a cross-carrier scheduling scenario in which multiple scheduling cells 702 can be used to schedule on one of the scheduled cells 704. Accordingly, the BS 705 can transmit DCI on the scheduling cell 702 such that the UE 715 can detect the DCI within a number of BDs calculated based on the SCS selection configuration.

[0111] Figure 8A and 8B Cross-carrier scheduling schemes 800, 850 according to aspects of the disclosure are shown. A UE, such as the UEs 115, 415, 615, 715 in a network, such as the network 100, can employ the schemes 800, 850 for communication. The schemes 800, 850 can be performed based on parameters of search space configurations 560 indicated in the RRC information element 550 described above in Figure 5B A UE (e.g., one of the UEs 115 or 415) can be connected to a BS (e.g., one of the BSs 105, 405, 605, 705) via multiple serving cells. In the illustrated scenario, the UE is connected to the BS via a Pcell 810 and a Scell 820, where the Pcell 820 or the Scell 820 can be used to schedule DL (e.g., PDSCH) and / or UL data transmissions (e.g., PUSCH) on the Pcell 810. In some aspects, a search space 826 on the Scell 820 can be associated with DL / UL scheduling grants on the Pcell 810. In another aspect, a search space 824 on the Scell 820 can be associated with DL / UL self-scheduling grants of the Scell 820. In another aspect, a search space 822 on the Scell 820 can be associated with DL / UL scheduling grants on a different cell, such as a Scell.

[0112] The UE monitors for DCI in the Pcell 810 in search space 812, which can also be referred to as PDCCH candidates. The UE also monitors for DCI in the Scell 820 in search space 822, which includes PDCCH candidates 822a, 822b, and 822c. Although shown separately, it should be understood that PDCCH candidates 822a, 822b, 822c are within the same search space 822. PDCCH candidates 822a, 822b, 822c can correspond to different scheduled cells. For example, PDCCH candidate 822a corresponds to DCI for scheduling on Pcell 810, and PDCCH candidate 822b corresponds to DCI for self-scheduling on Scell 820. The DCI received in search spaces 812, 822 can include DL / UL scheduling grants for Pcell 810. The UE can be configured with one or more search space configurations, which include a slot periodicity, a slot offset, a duration, and / or any other appropriate search space configuration parameters. In one aspect, each of search spaces 812, 822 is associated with a different search space configuration.

[0113] With reference to Figure 8A , the UE can perform scheduling of DL and / or UL data on Pcell 810 by performing a number of BDs in PDCCH candidates 812 of search space 812 and / or 822a of search space 822. The number of BDs can be based on one of the SCSs of the scheduled cells. For example, the UE can be configured to determine the number of BDs for monitoring DCI based on the lower SCS of the two scheduled cells 810, 820. Alternatively, the UE can be configured to determine the number of BDs for monitoring DCI based on the higher SCS of the two scheduled cells 810, 820. Alternatively, the UE can be configured to determine the number of BDs for monitoring DCI based on an SCS explicitly configured by RRC signaling.

[0114] In Figure 8AIn scenario 800, the number of BDs is determined using the SCS of Pcell 810. In this scenario 800, the number of BDs is counted in the cell that schedules DL and / or UL data for the scheduled cell. Therefore, the UE in Pcell 810 performs a first subset of BDs against PDCCH candidates in search space 812, and the UE in Scell ​​820 performs a second subset of BDs against PDCCH candidates 822a in search space 822. In this respect, to schedule DL and / or UL data on Pcell 810, as shown in box 830, the number of BDs per Pcell slot is allocated or assigned between Pcell 810 and Scell ​​820. Box 830 contains PDCCH candidates (e.g., 822a) that the UE can search within a determined BD / CCE budget. Figure 8A In this process, the number of BDs and / or non-overlapping CCEs is counted for each Pcell time slot, where the duration of each Pcell time slot can be longer than that of an Scell ​​time slot. For example, in one aspect, Pcell 810 has a 15 kHz SCS and a 1.0 ms time slot length, while Scell ​​820 has a 30 kHz SCS and a 0.5 ms time slot length. Therefore, the number of BDs and / or CCEs is counted on a single time slot of Pcell 820, but on two time slots of Scell ​​820. In other words, the number of BDs per time slot is determined based on the time slot duration of the scheduled cell.

[0115] refer to Figure 7 In one aspect, the number of BDs in a subset associated with the first cell (Pcell 710) is determined such that the number of BDs in each scheduled cell is proportional to the SCS configuration of each scheduled cell, or inversely proportional to the slot length. In other aspects, the number of BDs can be determined based on the ratio of the number of slots in the monitoring period or subframe of the scheduled cell to the sum of the number of slots in the monitoring period of all scheduled cells. For example, given a scheduled cell X(N) SubX The number of BDs in a given subset of the associated dataset can be based on the following relationship:

[0116]

[0117] Where, N BD It is the total number of BDs across scheduling cells, N. Slots,X It is the number of time slots per subframe (1ms) configured in the SCS of cell X, while N Slots,Yis the number of slots per subframe (1 ms) of the SCS configuration of the scheduling cell Y. For example, a Pcell 710 with a 15 kHz SCS can have 1 slot per subframe (1 ms), while a Scell 720 with a 30 kHz SCS can have 2 slots per subframe (1 ms). Thus, if a total of 35 BDs are counted on the Pcell 710 with a 15 kHz SCS and the Scell 720 with a 30 kHz SCS, the number of BDs allocated to the Pcell 710 can be 35 x (1 / (1+2)), while the number of BDs allocated to the Pcell 810 can be 35 x (2 / (1+2)).

[0118] Referring again to Figure 7 In one aspect, the number of BDs in the subset associated with the first cell (Pcell 710) is N p The number of BDs in the subset associated with the second cell (Scell 720) is N BD -N p where N p is the maximum number of BDs that the UE needs to monitor in one slot among all slots of the first cell (Pcell 710).

[0119] Referring to Figure 7 In one aspect, the number of BDs in the subset associated with the first cell (Pcell 710) and / or the number of BDs in the subset associated with the second cell (Scell 720) are configured as part of the RRC configuration, where the total number of BDs associated with the first cell (Pcell 710) and the second cell (Scell 710) does not exceed N BD .

[0120] In contrast to the scheme 800 shown in Figure 8A In contrast to the scheme 800 shown in Figure 8B The scheme 850 shown in Figure 8A In contrast to the scheme 800 shown in

[0121] In some aspects, the network 100 can configure the UE 115 via the BS 105 such that the UE 115 does not need to perform more than the first subset of BDs for PDCCH candidates of the search space 812 on the Pcell 810 and the second subset of BDs for PDCCH candidates 822a of the search space 822 on the Scell 820. Figure 6 and 7The described BD / CCE limits more BDs. However, in some aspects, the number of BDs or PDCCH candidates associated with a search space set can exceed the limit for BDs and / or PDCCH candidates for a given slot. For example, for PDCCH candidates associated with scheduling DL and / or UL data on a Pcell or P(S)cell, as shown in Figure 8A and 8B the number of PDCCH candidates counted across cells within a given slot exceeds the BD limit determined based on the SCS of the scheduling cell. Thus, the UE can be configured to drop or prune one or more PDCCH candidates from a search space set such that the number of BDs performed by the UE does not exceed the limits provided above (e.g., equations (2)-(5)). The present disclosure provides mechanisms for dropping or pruning PDCCH candidates based on search space configuration parameters. Dropping or pruning PDCCH candidates can refer to the UE skipping monitoring of these PDCCH candidates. In other words, the UE does not perform BDs for dropped PDCCH candidates.

[0122] Figure 9 and Figure 10 According to aspects of the present disclosure, control channel information monitoring schemes 900, 1000 are shown, respectively. A UE, such as a UE 115, 415, in a network, such as network 100 in a CA communication scenario, can employ schemes 900, 1000. Schemes 900, 1000 can be performed based on parameters of search space configurations 560 indicated in RRC information element 550 described above in Figure 5B Schemes 900, 1000 can be performed by a UE (e.g., one of UEs 115, 415, 615, 715) connected to a BS (e.g., one of BSs 105, 405, 605, 705) via multiple serving cells. In Figure 9 In scheme 900, the UE is connected to the BS via a first cell 910 with a cell index of 0, a second cell 920 with a cell index of 1, and a third cell 930 with a cell index of 2. The cell index can be a carrier indicator field (CIF) value. In one aspect, the first cell 910 can be a Pcell, and the second and third cells 920, 930 can be Scells. Figure 9 A number of search spaces or PDCCH candidates associated with a cell are shown, where each search space is associated with a search space identifier value. It should be understood that each search space can be associated with one search space configuration (e.g., Figure 5BThe configuration shown in 560 is associated with this. The search space identifier value can be indicated in a field of the search space configuration. For example, the UE in the first cell 910 monitors the first search space 912 and the second search space 914. The first search space 912 has a search space identifier of 0, while the second search space 914 has a search space identifier of 2. Furthermore, the UE in the second cell 920 monitors the third search space 922 and the fourth search space 924. The third search space 922 has a search space identifier of 1, and the fourth search space 924 has a cell identifier of 4. The UE in the third cell monitors the fifth search space 926. The fifth search space 932 has a cell identifier of 3.

[0123] exist Figure 9 In scheme 900, the UE is configured to discard search space based on an associated search space identifier value. Specifically, the UE is configured to discard search space starting from a higher search space identifier value until the amount of remaining search space is within the BD limit that the UE is configured to perform during monitoring period 902 (e.g., a 1ms or 0.5ms slot depending on the SCS). Figure 9 In this scenario, the UE is configured to discard the fourth search space 924, which has the highest search space identifier value of 4. The remaining search spaces 912, 914, 922, and 932 fall within the UE's BD budget, which is four in this scenario. However, it should be understood that... Figure 9 The scheme 900 shown is exemplary, and the UE can be configured to discard or retain more search space than specifically shown. In some aspects, lower-indexed search spaces (e.g., search index 0 for the common search space) can carry more scheduling / DCI for more important information (e.g., system information), so the UE can discard search space from the highest search space index to a lower index. In some other aspects, the UE can discard search space in the reverse order, for example, from the lowest search space index to the highest search space index.

[0124] exist Figure 10 In scheme 1000, the UE connects to the BS via a first cell 1010 with cell index 0, a second cell 1020 with cell index 1, and a third cell 1030 with cell index 2. The cell index can be a carrier indicator field (CIF) value. In one aspect, the first cell 1010 can be a Pcell, and the second cell 1020 and the third cell 1030 can be Scells. Figure 10 Multiple search spaces or PDCCH candidates associated with a cell are shown, each search space being associated with a search space identifier value. It should be understood that each search space can be configured with one search space (e.g., Figure 5BThe configuration shown in Figure 560 is associated with a search space identifier value. The search space identifier value can be indicated in a field of the search space configuration. For example, the UE in the first cell 1010 executes a first search space 1012 and a second search space 1014. The first search space has a search space identifier of 0, and the second search space 1014 has a search space identifier of 2. Furthermore, a third search space 1022 and a fourth search space 1024 are executed in the second cell 1020. The third search space 1022 has a search space identifier of 1, and the fourth search space 1024 has a cell identifier of 4. A fifth search space 1032 is executed in the third cell. The fifth search space 1032 has a cell identifier of 3. Each search space can be associated with a search space configuration (e.g., as shown above in Figure 560). Figure 5B The configuration shown in the diagram (560) is associated with this.

[0125] exist Figure 10 In the illustrated scheme 1000, the UE is configured to discard search spaces based on the cell index associated with each search space. Specifically, the UE is configured to discard search spaces associated with higher cell indices until the remaining number of search spaces falls within the number of BD and / or PDCCH candidate limits determined for monitoring period 1002 (e.g., depending on the 1ms or 0.5ms slot of the SCS). Therefore, the UE is configured to discard the fifth search space 1032 associated with the highest cell index value 2. The remaining search spaces 1012, 1014, 1022, and 1024 fall within the BD and / or CCE budget determined by the UE. Therefore, the UE monitors the DCI in the remaining search spaces 1012, 1014, and 1022. However, it should be understood that... Figure 10 The scheme 1000 shown is exemplary, and the UE can be configured to discard or retain more search space than specifically shown. In some aspects, the UE can discard search space based on the cell index, followed by the search space index. For example, if the number of BDs still exceeds the limit after discarding search space 1032, the UE can discard search space 1024 based on the fact that search space 1024 is within cell 1020 with the next highest cell index and that search space 1024 is the search space with the highest search space index in cell 1020.

[0126] Figure 11 This is a block diagram of an exemplary BS1100 based on some aspects of this disclosure. The BS1100 can be as shown above. Figure 1The network 100 discussed herein includes BS105. As shown, BS1100 may include a processor 1102, a memory 1104, an intercarrier scheduling module 1108, a transceiver 1110 (which includes a modem subsystem 1112 and an RF unit 1114), and one or more antennas 1116. These components may communicate directly or indirectly with each other, for example, via one or more buses.

[0127] Processor 1102 may have various features as a particular type of processor. For example, these may include: a CPU, DSP, ASIC, controller, FPGA device, another hardware device, firmware device, or any combination thereof configured to perform the operations described herein. Processor 1102 may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, several microprocessors, one or more microprocessors combined with a DSP core, or any other such architecture.

[0128] Memory 1104 may include cache memory (e.g., cache memory of processor 1102), RAM, MRAM, ROM, PROM, EPROM, EEPROM, flash memory, solid-state memory devices, one or more hard disk drives, memristor-based arrays, other forms of volatile and non-volatile memory, or combinations of different types of memory. In some aspects, memory 1104 may include non-transitory computer-readable media. Memory 1104 may store instructions 1106. Instructions 1106 may include, when executed by processor 1102, causing processor 1102 to perform the operations described herein (e.g., ...). Figures 3-7 10 and Figure 12 (All aspects). Instruction 1106 may also be referred to as program code. Program code can be used to cause a wireless communication device to perform these operations, for example, by causing one or more processors (e.g., processor 1102) to control or command the wireless communication device to do so. The terms “instruction” and “code” should be interpreted broadly to include any type of computer-readable statement. For example, the terms “instruction” and “code” can refer to one or more programs, routines, subroutines, functions, procedures, etc. “Instruction” and “code” can include a single computer-readable statement or multiple computer-readable statements.

[0129] The cross-carrier scheduling module 1108 can be implemented via hardware, software, or a combination thereof. For example, the cross-carrier scheduling module 1108 can be implemented as a processor, circuitry, and / or instructions 1106 stored in memory 1104 and executed by processor 1102. In some examples, the cross-carrier scheduling module 1108 can be integrated within the modem subsystem 1112. The cross-carrier scheduling module 1108 can be implemented by a combination of software components (e.g., executed by a DSP or general-purpose processor) and hardware components (e.g., logic gates and circuitry) within the modem subsystem 1112.

[0130] The cross-carrier scheduling module 1108 can be used in various aspects of this disclosure (e.g., Figures 3-10 and / or Figure 13 (Various aspects). In one aspect, the cross-carrier scheduling module 1108 is configured to send a first configuration to the UE (e.g., one of UE 115, 415, 615, 715, 1200) for scheduling in a first cell, wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first SCS. In another aspect, the cross-carrier scheduling module 1108 is configured to send a second configuration to the UE for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS. In another aspect, the cross-carrier scheduling module 1108 is configured to send a third configuration to the UE indicating a third SCS associated with the number of DCI BDs in the first and second search spaces, wherein the third SCS corresponds to one of the first SCS or the second SCS. In another aspect, the cross-carrier scheduling module 1108 is configured to send DCIs to the UE in at least one of the first or second search spaces.

[0131] As illustrated, transceiver 1110 can include modem subsystem 1112 and RF unit 1114. Transceiver 1110 can be configured to communicate bi-directionally with other devices, for example, UE 115 and / or another core network element. Modem subsystem 1112 can be configured to modulate and / or encode data according to a MCS, for example, an LDPC coding scheme, a turbo coding scheme, a convolutional coding scheme, a digital beamforming scheme, etc. RF unit 1114 can be configured to process (e.g., perform analog to digital conversion or digital to analog conversion, etc.) modulated / encoded data (e.g., PDCCH, PDSCH, SSB, SIB, initial BWP configuration, PDCCH common configuration, search space configuration) from modem subsystem 1112 (on outbound transmissions) or of transmissions originating from another source such as a UE 115. Additionally, RF unit 1114 can be configured to perform analog beamforming in conjunction with the digital beamforming of modem subsystem 1112. Although shown as integrated with transceiver 1110, modem subsystem 1112 and / or RF unit 1114 can be separate devices coupled to BS 105 to enable BS 105 to communicate with other devices.

[0132] RF unit 1114 can provide the modulated and / or processed data, e.g. data packets (or, specifically, data messages containing one or more data packets and other information) to antenna 1116 for transmission to one or more other devices. This can include, for example, transmitting information to complete attachment to a network and communication with a camped UE 115, in accordance with some aspects of the present disclosure. Antenna 1116 can also receive data messages transmitted from other devices and provide the received data messages for processing and / or demodulation at transceiver 1110. Transceiver 1110 can provide demodulated and decoded data (e.g., UE capability report, MSG1, MSG3, ACK / NACK, PUCCH, PUSCH) to cross-carrier scheduling module 1108 for processing. Antenna 1116 can include multiple antennas of similar or different design schemes to maintain multiple transmission links.

[0133] In some aspects, processor 1102 is configured to coordinate with cross-carrier scheduling module 1108 to transmit, to a UE, a search space configuration associated with a second SCS of a scheduled cell on a scheduling cell having a first SCS and transmit, to the UE, DCI on the scheduling cell.

[0134] In one aspect, the BS 1100 can include multiple transceivers 1110 implementing different RATs (e.g., NR and LTE). In one aspect, the BS 1100 can include a single transceiver 1110 implementing multiple RATs (e.g., NR and LTE). In one aspect, the transceiver 1110 can include various components, where different combinations of components can implement different RATs.

[0135] Figure 12 is a block diagram of an example UE 1200 according to some aspects of the present disclosure. The UE 1200 can be a UE 115 as discussed above in Figure 1 , and can implement aspects of the present disclosure. As illustrated, the UE 1200 can include a processor 1202, a memory 1204, a cross-carrier scheduling module 1208, a transceiver 1210 including a modem subsystem 1212 and a radio frequency (RF) unit 1214, and one or more antennas 1216. These elements can be in electronic communication via one or more buses (e.g., a bus 1203). The UE 1200 can also include one or more user interface

[0136] The processor 1202 can include a central processing unit (CPU), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a controller, a field

[0137] The memory 1204 can include a cache memory (e.g., of the processor 1202), random access memory (RAM), magnetoresistive RAM (MRAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), flash memory, solid-state memory device, hard disk drive, other forms of volatile and non-volatile memory, or a combination of different types of memory. In one aspect, the memory 1204 includes a non-transitory computer-readable medium. The memory 1204 can store instructions 1206 or data 1208 Figures 3-7 , 10, and Figure 11instructions 1206 can also be referred to as program code, which can be broadly interpreted as including any type of computer readable statement, as discussed above with regard to FIG. 8.

[0138] The cross-carrier scheduling module 1208 can be implemented via hardware, software, or combinations thereof. For example, the cross-carrier scheduling module 1208 can be implemented as a processor, circuit, and / or instructions 1206 stored in the memory 1204 and executed by the processor 1202. In some examples, the cross-carrier scheduling module 1208 can be integrated in the modem subsystem 1212. The cross-carrier scheduling module 1208 can be implemented through a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates, circuit, etc.) within the modem subsystem 1212.

[0139] The cross-carrier scheduling module 1208 can be used in various aspects of the present disclosure, for example Figures 3-10 and aspects of FIGs. 12 and 13. In one aspect, the cross-carrier scheduling module 1208 is configured to receive, from a BS (e.g., one of the BSs 105, 405, 1100), a first configuration for scheduling in a first cell, where the first configuration is associated with a first search space in the first cell, and where the first cell is associated with a first SCS. The cross-carrier scheduling module 1208 is further configured to receive, from the BS, a second configuration for scheduling in the first cell, where the second configuration is associated with a second search space in a second cell different from the first cell, and where the second cell is associated with a second SCS different from the first SCS. The cross-carrier scheduling module 1208 is further configured to determine a number of BDs based on at least one of the first SCS or the second SCS, and monitor the first search space and the second search space for DCI based on the number of BDs.

[0140] As illustrated, the transceiver 1210 can include the modem subsystem 1212 and the RF unit 1214. The transceiver 1210 can be configured to communicate bi-directionally with other devices, for example, the BS 105. The modem subsystem 1212 can be configured to modulate and / or encode data from the memory 1204 and / or the cross-carrier scheduling module 1208, according to a modulation and coding scheme (MCS), for example, a low-density parity check (LDPC) coding scheme, a turbo coding scheme, a convolutional coding scheme, a digital beamforming scheme, etc. The RF unit 1214 can be configured to process (e.g., perform analog to digital conversion or digital to analog conversion, etc.) modulated / encoded data (e.g., UE capability report, MSG1, MSG3, ACK / NACK, PUCCH) from the modem subsystem 1212 (with respect to outbound transmissions) or transmissions originating from another source such as a UE 115 or a BS 105. Additionally, the RF unit 1214 can be configured to perform analog beamforming in conjunction with the digital beamforming. Although shown as integrated with the transceiver 1210, the modem subsystem 1212 and the RF unit 1214 can be separate devices coupled with one another at the UE 115 to enable the UE 115 to communicate with other devices.

[0141] The RF unit 1214 can provide the modulated and / or processed data, e.g. data packets (or, specifically, data messages containing one or more data packets and other information) to the antennas 1216 for transmission to one or more other devices. The antennas 1216 can further receive data messages transmitted from other devices. The antennas 1216 can provide the received data messages for processing and / or demodulation at the transceiver 1210. The transceiver 1210 can provide demodulated and decoded data (e.g., PDCCH, PDSCH, RRC configuration, SSB, SIB, PDCCH, search space configuration) to the cross-carrier scheduling module 1208 for processing. The antennas 1216 can include multiple antenna pads with similar or different design schemes to maintain multiple transmission links. The RF unit 1214 can configure the antennas 1216.

[0142] In some aspects, the processor 1202 is configured to coordinate, with the cross-carrier scheduling module 1208, to perform DCI monitoring in a scheduling cell having a first SCS using a search space configuration associated with a second SCS of a scheduled cell.

[0143] In one aspect, UE 1200 can include multiple transceivers 1210 implementing different RATs (e.g., NR and LTE). In one aspect, UE 1200 can include a single transceiver 1210 implementing multiple RATs (e.g., NR and LTE). In one aspect, transceiver 1210 can include various components, where different combinations of components can implement different RATs.

[0144] Figure 13 is a signaling diagram illustrating a cross-carrier scheduling method 1300 according to some aspects of the disclosure. The method 1300 can be implemented between a BS 1302, a UE 1304. The BS 1302 can correspond to the BS 105, 405, or 1100, and the UE can correspond to the UE 115, 415, or 1200. In some instances, the UE 1304 can be configured for carrier aggregation (CA) and cross-carrier scheduling between multiple serving cells, including a Pcell and at least one Scell. The method 1300 can be implemented in conjunction with the schemes 300, 400, 500, 600, 700, 800, 850, 900, 1000, and / or 1300 discussed with reference to FIGS. 3-13, respectively. As illustrated, the method 1300 includes a number of enumerated actions, but embodiments of the method 1300 can perform additional actions before, after, and in between the enumerated actions. In some embodiments, one or more of the enumerated actions can be omitted or performed in a different order. Figures 3-10

[0145] At a high level, to monitor for DCI on different cells associated with different SCS, the UE 1304 can determine a number of BDs and / or CCEs based on the SCS of one of the scheduling cells. For example, when DL / UL data transmission on a scheduled cell can be scheduled by more than one scheduling cell, the UE can determine the number of BDs and / or CCEs based on the higher or lower SCS of the scheduling cell. In another aspect, the UE can determine the number of BDs and / or CCEs based on the SCS explicitly configured by RRC signaling. The BDs and / or CCEs can be counted across the scheduling cells, as DCI can be transmitted on any scheduling cell for a given scheduled cell. The BS can transmit DCI according to this framework such that the UE is able to detect the DCI within the BD and / or CCE limit determined by the UE.

[0146] ​At action 1305, the BS 1302 transmits a first search space configuration to the UE. In some aspects, the first search space configuration can be for scheduling on a first cell (which can be a Pcell), and the first search space configuration can be transmitted to the UE via the first cell or a second cell (which can be a Scell). For example, the UE 1304 can use the first search space configuration to monitor for DCI in a search space within the second cell, where the search space of the second cell is used to schedule data transmissions on the first cell. The first search space configuration can include or indicate a plurality of parameters for monitoring for the DCI. For example, the first search space configuration can indicate a slot periodicity and offset, a duration, a starting symbol, or any other appropriate parameter. Further, the first search space configuration can indicate a search space identifier value and a cell index (e.g., CIF) for which to perform the search space. The first search space configuration can include one or more of the parameters in the search space configuration 560. The first search space configuration can be included in an RRC information element or message. In one aspect, the first search space configuration can be a UE-specific search space configuration for monitoring for DCI in a search space of a Scell, where the DCI in the search space indicates scheduling information for scheduling DL and / or UL data on a Pcell. The first search space configuration can be based on or associated with an SCS of the cell on which the search space is used. For example, the Pcell can have a first SCS, and the Scell can have a second SCS that is higher than the first SCS. In one aspect, the first SCS can be 15 kHz, and the second SCS can be 30 kHz, 120 kHz, or any other appropriate SCS value. In some cases, the BS 1302 can utilize one or more components, such as the processor 1102, the memory 1104, the cross-carrier scheduling module 1108, the transceiver 1110, the modem 1112, and one or more antennas 1116, to perform aspects of the action 1305.

[0147] At act 1310, the BS 1302 transmits a second search space configuration to the UE. In some aspects, the second search space configuration can be for scheduling on the second cell, and can be transmitted via the first cell or the second cell. For example, the UE 1304 can use the second search space configuration to monitor for DCI in a search space within the second cell, where the search space is for scheduling data transmissions on the second cell. The second search space configuration can include or indicate a plurality of parameters for monitoring for DCI. The second search space configuration can indicate a slot periodicity and offset, a duration, a starting symbol, or any other appropriate parameter. For example, the second search space configuration can include one or more of the parameters in the search space configuration 560. The second search space configuration can be included in an RRC information element or message. Further, the second search space configuration can indicate a search space identifier value and a cell index (e.g., CIF) for which to perform a search space. The second search space configuration can be based on or associated with an SCS of a cell on which the search space is used. In one aspect, the second search space configuration can be a UE-specific search space configuration for monitoring for DCI on a Scell with a second SCS. In some cases, the BS 1302 can utilize one or more components, such as the processor 1102, the memory 1104, the cross-carrier scheduling module 1108, the transceiver 1110, the modem 1112, and one or more antennas 1116, to perform aspects of act 1310.

[0148] In some aspects, the first search space configuration can indicate a search space index of 1 that references a search space in the second cell. The second search space configuration can also indicate a search space index of 1 that references the same search space in the second cell. However, the first search space configuration and the second search space configuration can have different monitoring periodicity parameters and / or different monitoring slot offset parameters, as discussed above with respect to Figure 7

[0149] At act 1315, the UE 1304 detects the first search space configuration. In some aspects, the first search space configuration can be detected on the Pcell or the Scell. Detecting the first search space configuration can include receiving and decoding an RRC information element. The first search space configuration can be associated with an SCS of the Pcell, which can be the scheduled cell in a cross-carrier scheduling scenario. In some cases, the UE 1304 can utilize one or more components, such as the processor 1202, the memory 1204, the cross-carrier scheduling module 1208, the transceiver 1210, the modem 1212, and one or more antennas 1216, to perform aspects of act 1315.

[0150] ​At action 1320, the UE 1304 detects a second search space configuration. In some aspects, the second search space configuration can be detected on the Pcell or the Scell. Detecting the second search space configuration can include receiving and decoding a RRC information element. The second search space configuration can be associated with an SCS of the Scell, which can be a scheduling cell in a cross-carrier scheduling scenario. In some aspects, the SCS of the Scell can be different than the SCS of the Pcell. For example, the SCS of the Scell can be greater than the SCS of the Pcell. In some cases, the UE 1304 can utilize one or more components, such as the processor 1202, the memory 1204, the cross-carrier scheduling module 1208, the transceiver 1210, the modem 1212, and one or more of the one or more antennas 1216, to perform aspects of action 1320.

[0151] At action 1325, the UE 1304 determines a maximum number of BDs (PDCCH candidates) per monitoring period for monitoring DCI. As explained above, in some aspects, more than one cell can be used to schedule DL / UL transmissions on a scheduled cell. Thus, monitoring DCI to schedule data transmissions on a scheduled cell can include counting search spaces or PDCCH candidates across multiple scheduling cells. Further, the scheduling cells can have different SCSs. Because the number of BDs performed within a monitoring period is based on the SCS, the UE determines the number of BDs based on the SCS associated with at least one of the scheduling cells. For example, the UE can use equations (2) and (3) and determine the number of BDs based on the lower SCS of the scheduling cells. For example, if both the Pcell and the Scell can be used to schedule DL / UL transmissions on the Pcell, the UE can determine the number of BDs based on the SCS of the Pcell, which has a lower SCS than the Scell. In another aspect, the UE can determine the number of BDs based on the higher SCS of the scheduling cells. For example, if both the Pcell and the Scell can be used to schedule DL / UL transmissions on the Pcell, the UE can determine the number of BDs based on the SCS of the Scell, which has a higher SCS than the Pcell.

[0152] Because the BS 1302 can transmit DCI on either scheduling cell, the number of BDs determined in action 1325 can be counted across the scheduling cells, as explained above in Figure 8A and 8BThe number of BDs can be determined for each monitoring period, which can be a slot. In one aspect, the monitoring period can be based on the length of a slot of one of the scheduling cells. For example, if the SCS of the scheduling Scell is used to determine the number of BDs in act 1325, the number of BDs can be counted for the length of a slot in the scheduling Scell. Alternatively, if the SCS of the scheduling Pcell is used to determine the number of BDs in act 1325, the number of BDs can be counted for the length of a slot of the scheduling Pcell. In some cases, the UE 1304 can utilize one or more components of the UE 1304, such as the processor 1202, the memory 1204, the cross-carrier scheduling module 1208, the transceiver 1210, the modem 1212, and one or more of the one or more antennas 1216, to perform aspects of act 1320.

[0153] In act 1330, the UE 1304 drops or prunes search spaces or PDCCH candidates that exceed the BD limit determined in act 1325 within each monitoring period. The UE can drop search spaces based on a search space identifier value associated with each search space and / or a cell index (e.g., CIF) associated with each search space, as shown above in FIG. 13 and as described in more detail below. In some cases, the UE 1304 can utilize one or more components of the UE 1304, such as the processor 1202, the memory 1204, the cross-carrier scheduling module 1208, the transceiver 1210, the modem 1212, and one or more of the one or more antennas 1216, to perform aspects of act 1330. Figure 9 and Figure 10 In some cases, the UE 1304 can utilize one or more components of the UE 1304, such as the processor 1202, the memory 1204, the cross-carrier scheduling module 1208, the transceiver 1210, the modem 1212, and one or more of the one or more antennas 1216, to perform aspects of act 1330.

[0154] At action 1335, the BS 1302 transmits DCI via the Scell. In some aspects, the DCI can include a first DCI transmitted in a search space within the Scell according to a first search space configuration, and a second DCI transmitted in a search space within the Scell according to a second search space configuration. The DCI can include scheduling information for DL and / or UL data on the Pcell and / or the Scell. For example, the first DCI can indicate a location of DL data in a PDSCH on the Pcell, or can include an UL grant for UL data in a PUSCH on the Pcell. Further, the second DCI can indicate a location of DL data in a PDSCH on the Scell. The BS 1302 can transmit the DCI according to the framework for determining the above-described BD and / or CCE limits by the UE 1304, such that the UE can successfully detect the DCI within the BD and / or CCE limits. In some cases, the BS 1302 can utilize one or more components, such as the processor 1102, the memory 1104, the cross-carrier scheduling module 1108, the transceiver 1110, the modem 1112, and one or more antennas 1116, to perform aspects of the action 1335.

[0155] At action 1340, the BS 1302 transmits DL data in a PDSCH via the Pcell. The DL data is transmitted according to scheduling information provided in DCI (the first DCI) associated with the Pcell, and to the UE 1304 in a search space of the Scell according to the first search space configuration. In some cases, the BS 1302 can utilize one or more components, such as the processor 1102, the memory 1104, the cross-carrier scheduling module 1108, the transceiver 1110, the modem 1112, and one or more antennas 1116, to perform aspects of the action 1035.

[0156] At action 1345, the UE 1004 detects DCI on the Scell. Detecting the DCI can include successfully decoding the DCI based on the determined number of BDs described above with respect to action 1325. In some aspects, detecting the DCI on the Scell can include detecting multiple DCIs in PDCCH candidates within a search space of the Scell, where each DCI (e.g., the first DCI, the second DCI) is associated with scheduling DL and / or UL data on a different scheduled cell, as explained above. In some cases, the UE 1304 can utilize one or more components, such as the processor 1202, the memory 1204, the cross-carrier scheduling module 1208, the transceiver 1210, the modem 1212, and one or more antennas 1216, to perform aspects of the action 1345.

[0157] At action 1350, the UE 1304 detects DL data transmitted via the PDSCH in the Pcell in action 1340. The DL data can be detected according to scheduling information provided in the search space of the Scell in the DCI. In some cases, the UE 1304 can utilize one or more components, such as the processor 1202, the memory 1204, the cross-carrier scheduling module 1208, the transceiver 1210, the modem 1212, and one or more antennas 1216, to perform aspects of action 1350.

[0158] At action 1355, which can be optional or an alternative to action 1350, the UE 1304 generates and prepares UL data for transmission in the PUSCH on the Pcell according to the UL grant provided in the DCI detected in action 1345. In some aspects, the Scell (which is the scheduling cell in the illustrated scenario) can not have UL resources. Thus, the UL transmission can be scheduled in the Pcell, or in a different Scell other than the scheduling Scell. In some cases, the UE 1304 can utilize one or more components, such as the processor 1202, the memory 1204, the cross-carrier scheduling module 1208, the transceiver 1210, the modem 1212, and one or more antennas 1216, to perform aspects of action 1355.

[0159] At action 1360, which can be optional, the UE 1304 transmits the UL data to the BS 1302 in the PUSCH via the Pcell. In some cases, the UE 1304 can utilize one or more components, such as the processor 1202, the memory 1204, the cross-carrier scheduling module 1208, the transceiver 1210, the modem 1212, and one or more antennas 1216, to perform aspects of action 1360.

[0160] Figure 14 is a flow diagram of a wireless communication method 1400 according to some aspects of the present disclosure. Aspects of the method 1400 can be executed by a computing device (e.g., a processor, a processing circuit, and / or other suitable component) of a wireless communication device or other suitable means for performing the steps. For example, a wireless communication device such as a UE 115, 415, 1200 can utilize one or more components, such as the processor 1202, the memory 1204, the cross-carrier scheduling module 1208, the transceiver 1210, the modem 1212, and one or more antennas 1216, to execute the steps of method 1400. The method 1400 can implement aspects of the method 1300 described above in Figures 3-10 and Figure 13Similar mechanisms are described in the Background. As illustrated, the method 1400 includes a number of enumerated steps, but aspects of the method 1400 can include other steps before, after, and in between the enumerated steps. In some aspects, one or more of the enumerated steps can be omitted or performed in a different order.

[0161] At block 1410, the UE receives, from a BS (e.g., one of the BSs 105, 405, 605, 705, 1100), a first configuration for scheduling in a first cell, where the first configuration is associated with a first search space in the first cell, and where the first cell is associated with a first SCS.

[0162] At block 1420, the UE receives, from the BS, a second configuration for scheduling in the first cell, where the second configuration is associated with a second search space in a second cell different from the first cell, and where the second cell is associated with a second SCS different from the first SCS.

[0163] At block 1430, the UE determines a number of BDs based on at least one of the first SCS or the second SCS. In one aspect, determining the number of BDs includes selecting a lower SCS between the first SCS or the second SCS, and determining the number of BDs based on a configuration associated with the lower SCS. In one aspect, determining the number of BDs includes selecting a higher SCS between the first SCS or the second SCS, and determining the number of BDs based on a configuration associated with the higher SCS. In some aspects, the first configuration indicates a first monitoring periodicity and the second configuration indicates a second monitoring periodicity different from the first monitoring periodicity. In some aspects, determining the number of BDs is further based on at least one of the first monitoring periodicity, the first SCS, the second monitoring periodicity, or the first SCS.

[0164] At block 1440, the UE monitors for the DCI in the first search space and the second search space based on the number of BDs. In one aspect, monitoring for the DCI includes performing a first subset of the BDs in the first search space and a second subset of the BDs in the second search space. In one aspect, monitoring for the DCI includes determining whether a total number of DCI candidates in the first search space and the second search space exceeds the number of BDs and, in response to determining that the total number of DCI candidates exceeds the number of BDs, excluding the first search space or the second search space from the monitoring based on a search space identifier associated with the first search space and the second search space. In some aspects, the at least one of the first search space includes a first plurality of search spaces or the second search space includes a second plurality of search spaces, and monitoring for the DCI includes determining that a total number of DCI candidates in the at least one of the first plurality of search spaces exceeds the number of BDs, in response to determining that the total number of DCI candidates exceeds the number of BDs, excluding one or more search spaces from at least one of the first plurality of search spaces or the second plurality of search spaces based on a cell identifier associated with the one or more search spaces, and further excluding one or more other search spaces from the at least one of the first plurality of search spaces or the second plurality of search spaces based on a search space identifier associated with the one or more other search spaces.

[0165] In some aspects, the method 1400 further includes receiving, from the BS, an RRC configuration indicating a third SCS, where the third SCS corresponds to the first SCS or the second SCS. In some aspects, determining the number of BDs at block 1430 is further based on the third SCS.

[0166] Figure 15 FIG. 15 shows a flowchart of a wireless communication method 1500 according to some aspects of the present disclosure. The aspects of method 1500 can be executed by a computing device (e.g., a processor, processing circuit, and / or other suitable component) of a wireless communication device or other suitable means for performing the steps. For example, a wireless communication device such as a BS 105, 405, 1100 can utilize one or more components, such as processor 1102, memory 1104, cross-carrier scheduling module 1108, transceiver 1110, modem 1112, and one or more antennas 1116, to execute the steps of method 1500. The method 1500 can employ similar mechanisms as described above in Figures 3-10 and Figure 13 FIG. 15. As illustrated, the method 1500 includes a number of enumerated steps, but aspects of the method 1500 can include other steps before, after, and in between the enumerated steps. In some aspects, one or more of the enumerated steps can be omitted or performed in a different order.

[0167] At block 1510, the BS transmits, to a UE, a first configuration for scheduling in a first cell, wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first SCS.

[0168] At block 1520, the BS transmits, to the UE, a second configuration for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS.

[0169] At block 1530, the BS transmits, to the UE, a third configuration indicating a third SCS associated with a number of DCI BDs in the first search space and the second search space, wherein the third SCS corresponds to one of the first SCS or the second SCS. In one aspect, transmitting the third configuration indicating the third SCS includes transmitting, to the UE, an RRC configuration including the third configuration.

[0170] At block 1540, the BS transmits, to the UE, a DCI in at least one of the first search space or the second search space based on the number of DCI BDs.

[0171] In some aspects, the method 1500 further includes determining the number of DCI BDs based on the third SCS and a capability of the UE.

[0172] The present disclosure also includes aspects of the following:

[0173] 1. A method of wireless communication performed by a user equipment (UE), the method comprising:

[0174] receiving, from a base station (BS), a first configuration for scheduling in a first cell, wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first subcarrier spacing (SCS);

[0175] receiving, from the BS, a second configuration for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS;

[0176] determining a number of blind detections (BDs) based on at least one of the first SCS or the second SCS; and

[0177] monitoring, based on the number of BDs, for downlink control information (DCI) in the first search space and the second search space.

[0178] 2. The method of claim 1, wherein determining the BD quantity comprises:

[0179] selecting a lower SCS between the first SCS or the second SCS; and

[0180] determining the BD quantity based on a configuration associated with the lower SCS.

[0181] 3. The method of claim 1, wherein determining the BD quantity comprises:

[0182] selecting a higher SCS between the first SCS or the second SCS; and

[0183] determining the BD quantity based on a configuration associated with the higher SCS.

[0184] 4. The method of claim 1, further comprising:

[0185] receiving, from the BS, a radio resource control (RRC) configuration indicating a third SCS, wherein the third SCS corresponds to the first SCS or the second SCS,

[0186] wherein determining the BD quantity is further based on the third SCS.

[0187] 5. The method of any of claims 1-4, wherein the monitoring for the DCI comprises:

[0188] performing a first subset of the BDs in the first search space; and

[0189] performing a second subset of the BDs in the second search space.

[0190] 6. The method of any of claims 1-5, wherein the monitoring for the DCI comprises:

[0191] determining whether a total number of DCI candidates in the first search space and the second search space exceeds the BD quantity; and

[0192] in response to determining that the total number of DCI candidates exceeds the BD quantity, excluding a first search space or the second search space from the monitoring based on a search space identifier associated with the first search space and the second search space.

[0193] 7. The method of claim 6, wherein the at least one of the first search space comprises a first plurality of search spaces or the second search space comprises a second plurality of search spaces, and wherein the monitoring for the DCI comprises:

[0194] determining that a total number of DCI candidates in the at least one of the first plurality of search spaces or the second plurality of search spaces exceeds the BD number;

[0195] responsive to determining that the total number of DCI candidates exceeds the BD number, excluding one or more search spaces from the at least one of the first plurality of search spaces or the second plurality of search spaces based on a cell identifier associated with the one or more search spaces; and

[0196] further excluding one or more other search spaces from the at least one of the first plurality of search spaces or the second plurality of search spaces based on a search space identifier associated with the one or more other search spaces.

[0197] 8. The method of any one of claims 1-7, wherein the first configuration indicates a first monitoring periodicity, and wherein the second configuration indicates a second monitoring periodicity different from the first monitoring periodicity, and wherein determining the BD number is further based on at least one of: the first monitoring periodicity, the first SCS, the second monitoring periodicity, or the first SCS.

[0198] 9. A method of wireless communication performed by a base station (BS), the method comprising:

[0199] transmitting, to a user equipment (UE), a first configuration for scheduling in a first cell, wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first subcarrier spacing (SCS);

[0200] transmitting, to the UE, a second configuration for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS;

[0201] transmitting, to the UE, a third configuration indicating a third SCS associated with a number of blind detections (BDs) of downlink control information (DCI) in the first search space and the second search space, wherein the third SCS corresponds to one of the first SCS or the second SCS; and

[0202] transmitting, to the UE, DCI in at least one of the first search space or the second search space based on the number of DCI BDs.

[0203] 10. The method of claim 9, further comprising:

[0204] determining the number of blind detections (BDs) based on at least one of the first SCS or the second SCS; and monitoring, based on the number of BDs, downlink control information (DCI) in the first search space and the second search space.

[0205] 11. The method of any one of claims 9 or 10, wherein transmitting the third configuration indicating the third SCS comprises transmitting, to the UE, a radio resource control (RRC) configuration including the third configuration.

[0206] 12. A user equipment (UE), comprising:

[0207] a transceiver configured to:

[0208] receive, from a base station (BS), a first configuration for scheduling in a first cell, wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first subcarrier spacing (SCS);

[0209] receive, from the BS, a second configuration for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS; and

[0210] a processor configured to:

[0211] determine a number of blind detections (BDs) based on at least one of the first SCS or the second SCS; and monitor, based on the number of BDs, downlink control information (DCI) in the first search space and the second search space.

[0212] 13. The UE of claim 12, wherein the processor being configured to determine the number of BDs comprises the processor being configured to:

[0213] select a lower SCS between the first SCS or the second SCS; and

[0214] determine the number of BDs based on a configuration associated with the lower SCS.

[0215] 14. The UE of claim 12, wherein the processor being configured to determine the number of BDs comprises the processor being configured to:

[0216] select a higher SCS between the first SCS or the second SCS; and

[0217] determine the number of BDs based on a configuration associated with the higher SCS.

[0218] 15. The UE of claim 12, wherein the transceiver is further configured to:

[0219] receive, from the BS, a radio resource control (RRC) configuration indicating a third SCS, wherein the third SCS corresponds to the first SCS or the second SCS,

[0220] wherein the processor is configured to determine the number of BDs comprises the processor being configured to determine the number of BDs based on the third SCS.

[0221] 16. The UE of any of claims 12-15, wherein the processor is configured to monitor the DCI comprises the processor being configured to:

[0222] perform a first subset of the BDs in the first search space; and

[0223] perform a second subset of the BDs in the second search space.

[0224] 17. The UE of any of claims 12-16, wherein the processor is configured to monitor the DCI comprises the processor being configured to:

[0225] determine whether a total number of DCI candidates in the first search space and the second search space exceeds the number of BDs; and

[0226] in response to determining that the total number of DCI candidates exceeds the number of BDs, exclude, from the monitoring, the first search space or the second search space based on a search space identifier associated with the first search space or the second search space.

[0227] 18. The UE of claim 17, wherein the at least one of the first search space comprises a first plurality of search spaces or the second search space comprises a second plurality of search spaces, and wherein the processor is configured to monitor the DCI comprises the processor being configured to:

[0228] determine that a total number of DCI candidates in the at least one of the first plurality of search spaces or the second plurality of search spaces exceeds the number of BDs;

[0229] in response to determining that the total number of DCI candidates exceeds the number of BDs, exclude, from the at least one of the first plurality of search spaces or the second plurality of search spaces, one or more search spaces based on a cell identifier associated with the one or more search spaces; and

[0230] to exclude one or more other search spaces from the at least one of the first plurality of search spaces or the second plurality of search spaces based on a search space identifier associated with the one or more other search spaces.

[0231] 19. The UE of any of claims 12-18, wherein the first configuration indicates a first monitoring periodicity, and wherein the second configuration indicates a second monitoring periodicity different from the first monitoring periodicity, and wherein the processor being configured to determine the number of BDs comprises the processor being configured to determine the number of BDs based on at least one of the first monitoring periodicity, the first SCS, the second monitoring periodicity, or the first SCS.

[0232] 20. A base station (BS), comprising:

[0233] a transceiver configured to:

[0234] transmit, to a user equipment (UE), a first configuration for scheduling in a first cell, wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first subcarrier spacing (SCS);

[0235] transmit, to the UE, a second configuration for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS;

[0236] transmit, to the UE, a third configuration indicating a third SCS associated with a number of downlink control information (DCI) blind detections (BDs) in the first search space and the second search space, wherein the third SCS corresponds to one of the first SCS or the second SCS; and

[0237] transmit, to the UE, DCI in at least one of the first search space or the second search space based on the number of DCI BDs.

[0238] 21. The BS of claim 20, further comprising a processor configured to:

[0239] determine the number of DCI BDs based on the third SCS and a capability of the UE.

[0240] 22. The BS of any one of claims 20 or 21, wherein the transceiver, configured to transmit the third configuration indicating the third SCS, comprises the transceiver configured to transmit, to the UE, a radio resource control (RRC) configuration including the third configuration.

[0241] 23. A non-transitory computer-readable medium having program code recorded thereon, the program code comprising:

[0242] code for causing a user equipment (UE) to receive, from a base station (BS), a first configuration for scheduling in a first cell, wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first subcarrier spacing (SCS);

[0243] code for causing the UE to receive, from the BS, a second configuration for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS;

[0244] code for causing the UE to determine a number of blind detections (BDs) based on at least one of the first SCS or the second SCS; and

[0245] code for causing the UE to monitor, based on the number of BDs, downlink control information (DCI) in the first search space and the second search space.

[0246] 24. The non-transitory computer-readable medium of claim 23, wherein the code for causing the UE to determine the number of BDs comprises:

[0247] code for causing the UE to select a lower SCS between the first SCS or the second SCS; and

[0248] code for causing the UE to determine the number of BDs based on a configuration associated with the lower SCS.

[0249] 25. The non-transitory computer-readable medium of claim 23, wherein the code for causing the UE to determine the number of BDs comprises:

[0250] code for causing the UE to select a higher SCS between the first SCS or the second SCS; and

[0251] code for causing the UE to determine the number of BDs based on a configuration associated with the higher SCS.

[0252] 26. The non-transitory computer-readable medium of claim 23, wherein the program code further comprises:

[0253] code for causing the UE to receive, from the BS, a radio resource control (RRC) configuration indicating a third SCS, wherein the third SCS corresponds to the first SCS or the second SCS,

[0254] wherein the code for causing the UE to determine the number of BDs comprises code for causing the UE to determine the number of BDs based on the third SCS.

[0255] 27. The non-transitory computer-readable medium of any one of claims 23-26, wherein the code for causing the UE to monitor for the DCI comprises:

[0256] code for causing the UE to perform a first subset of the BDs in the first search space; and

[0257] code for causing the UE to perform a second subset of the BDs in the second search space.

[0258] 28. The non-transitory computer-readable medium of any one of claims 23-27, wherein the code for causing the UE to monitor for the DCI comprises:

[0259] code for causing the UE to determine whether a total number of DCI candidates in the first search space and the second search space exceeds the number of BDs; and

[0260] code for causing the UE to exclude, from the monitoring, the first search space or the second search space based on a search space identifier associated with the first search space and the second search space, responsive to determining that the total number of DCI candidates exceeds the number of BDs.

[0261] 29. The non-transitory computer-readable medium of claim 28, wherein the at least one of the first search space comprises a first plurality of search spaces or the second search space comprises a second plurality of search spaces, and wherein the code for causing the UE to monitor for the DCI comprises:

[0262] code for causing the UE to determine that a total number of DCI candidates in the at least one of the first plurality of search spaces or the second plurality of search spaces exceeds the number of BDs;

[0263] to cause the UE to exclude, from at least one of the first plurality of search spaces or the second plurality of search spaces, code of one or more search spaces based on a cell identifier associated with the one or more search spaces in response to determining that the total number of DCI candidates exceeds the BD number; and

[0264] to cause the UE to exclude, from the at least one of the first plurality of search spaces or the second plurality of search spaces, code of one or more other search spaces based on a search space identifier associated with the one or more other search spaces further based on the DCI BD number.

[0265] 30. The non-transitory computer-readable medium of any of claims 23-29, wherein the first configuration indicates a first monitoring periodicity, and wherein the second configuration indicates a second monitoring periodicity different from the first monitoring periodicity, and wherein the code to cause the UE to determine the BD number includes code to cause the UE to determine the BD number based on at least one of: the first monitoring periodicity, the first SCS, the second monitoring periodicity, or the first SCS.

[0266] 31. A non-transitory computer-readable medium having program code recorded thereon, the program code comprising:

[0267] code to cause a base station (BS) to transmit, to a user equipment (UE), a first configuration for scheduling in a first cell, wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first subcarrier spacing (SCS);

[0268] code to cause the BS to transmit, to the UE, a second configuration for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS;

[0269] code to cause the BS to transmit, to the UE, a third configuration indicating a third SCS associated with a number of downlink control information (DCI) blind detections (BDs) in the first search space and the second search space, wherein the third SCS corresponds to one of the first SCS or the second SCS; and

[0270] code to cause the BS to transmit, to the UE, DCI in at least one of the first search space or the second search space based on the number of DCI BDs.

[0271] 32. The non-transitory computer-readable medium of claim 31, wherein the program code further comprises:

[0272] code for causing the BS to determine the number of DCI BDs based on the third SCS and a capability of the UE.

[0273] 33. The non-transitory computer-readable medium of any one of claims 31 or 32, wherein the code for causing the BS to transmit the third configuration indicating the third SCS comprises code for causing the BS to transmit, to the UE, a radio resource control (RRC) configuration including the third configuration.

[0274] 34. A user equipment (UE), comprising:

[0275] means for receiving, from a base station (BS), a first configuration for scheduling in a first cell, wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first subcarrier spacing (SCS);

[0276] means for receiving, from the BS, a second configuration for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS;

[0277] means for determining a number of blind detections (BDs) based on at least one of the first SCS or the second SCS; and

[0278] means for monitoring, based on the number of BDs, downlink control information (DCI) in the first search space and the second search space.

[0279] 35. The UE of claim 34, wherein the means for determining the number of BDs comprises:

[0280] means for selecting a lower SCS between the first SCS or the second SCS; and

[0281] means for determining the number of BDs based on a configuration associated with the lower SCS.

[0282] 36. The UE of claim 34, wherein the means for determining the number of BDs comprises:

[0283] means for selecting a higher SCS between the first SCS or the second SCS; and

[0284] means for determining the number of BDs based on a configuration associated with the higher SCS.

[0285] 37. The UE of claim 34, further comprising:

[0286] means for receiving, from the BS, a radio resource control (RRC) configuration indicating a third SCS, wherein the third SCS corresponds to the first SCS or the second SCS,

[0287] wherein the means for determining the number of BDs comprises means for determining the number of BDs based on the third SCS.

[0288] 38. The UE of any of claims 34-37, wherein the means for monitoring the DCI comprises:

[0289] means for performing a first subset of the BDs in the first search space; and

[0290] means for performing a second subset of the BDs in the second search space.

[0291] 39. The UE of any of claims 34-38, wherein the means for monitoring the DCI comprises:

[0292] means for determining whether a total number of DCI candidates in the first search space and the second search space exceeds the number of BDs; and

[0293] means for excluding, from the monitoring, a first search space or the second search space based on a search space identifier associated with the first search space and the second search space, in response to determining that the total number of DCI candidates exceeds the number of BDs.

[0294] 40. The UE of claim 39, wherein the at least one of the first search space comprises a first plurality of search spaces or the second search space comprises a second plurality of search spaces, and wherein the means for monitoring the DCI comprises:

[0295] means for determining that a total number of DCI candidates in the at least one of the first plurality of search spaces or the second plurality of search spaces exceeds the number of BDs;

[0296] means for excluding, from at least one of the first plurality of search spaces or the second plurality of search spaces, one or more search spaces based on a cell identifier associated with the one or more search spaces, in response to determining that the total number of DCI candidates exceeds the number of BDs; and

[0297] means for excluding one or more other search spaces from the at least one of the first plurality of search spaces or the second plurality of search spaces further based on a search space identifier associated with the one or more other search spaces.

[0298] 41. The UE of claims 34-40, wherein the first configuration indicates a first monitoring periodicity, and wherein the second configuration indicates a second monitoring periodicity different from the first monitoring periodicity, and wherein the means for determining the number of BDs comprises means for determining the number of BDs based on at least one of: the first monitoring periodicity, the first SCS, the second monitoring periodicity, or the first SCS.

[0299] 42. A base station (BS), comprising:

[0300] means for transmitting, to a user equipment (UE), a first configuration for scheduling in a first cell, wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first subcarrier spacing (SCS);

[0301] means for transmitting, to the UE, a second configuration for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS;

[0302] means for transmitting, to the UE, a third configuration indicating a third SCS associated with a number of downlink control information (DCI) blind detections (BDs) in the first search space and the second search space, wherein the third SCS corresponds to one of the first SCS or the second SCS; and

[0303] means for transmitting, to the UE, DCI in at least one of the first search space or the second search space based on the number of DCI BDs.

[0304] 43. The BS of claim 42, further comprising:

[0305] means for determining the number of DCI BDs based on the third SCS and a capability of the UE.

[0306] 44. The method of any of claims 42 or 43, wherein the means for transmitting the third configuration indicating the third SCS comprises means for transmitting, to the UE, a radio resource control (RRC) configuration including the third configuration.

[0307] Information and signals can be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that can be referenced throughout the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0308] A general-purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a discrete gate or transistor logic, discrete hardware components, or any combination thereof can be used to implement or perform the various example blocks and modules described in connection with the disclosure. A general-purpose processor can be a microprocessor, or, alternatively, the processor can be any conventional processor, controller, microcontroller, or state machine. A processor can also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0309] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described above can be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations thereof. Features implementing functions can also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations. Also, as used herein, including in the claims, "or" as used in a list of items prefaced by "at least one of" indicates a disjunctive list such that, for example, a list of "at least one of A, B, or C" means A or B or C or AB or AC or BC or ABC (i.e., A and B and C).

[0310] As those skilled in the art will readily appreciate, many modifications, substitutions and variations of the present disclosure can be made in the devices, materials, and methods of use of the present disclosure without departing from the spirit and scope of the disclosure. Accordingly, the scope of the present disclosure should be limited only by the appended claims and their equivalents, as they encompass all such modifications, substitutions and variations that fall within the scope of the claims and their functional equivalents.

Claims

1. A method for wireless communication performed by a user equipment (UE), the method comprising: Receive a first configuration for scheduling in a first cell from a base station (BS), wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first subcarrier spacing (SCS). Receives from the BS a second configuration for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS; and Based on the number of blind detections (BDs), downlink control information (DCI) is monitored in the second search space, wherein the number of BDs is based on at least one of the first SCS or the second SCS, and wherein the monitoring includes: The second search space, instead of the first search space, is allocated for the monitoring, wherein the allocation is in response to determining that the total number of DCI candidates in the first and second search spaces exceeds the number of BDs, and wherein the allocation is based on a search space identifier associated with the second search space.

2. The method according to claim 1, wherein, Determining the number of BDs includes: Select the lower SCS between the first SCS and the second SCS; and The number of BDs is determined based on the configuration associated with the lower SCS.

3. The method according to claim 1, wherein, Determining the number of BDs includes: Select the higher SCS between the first SCS and the second SCS; and The number of BDs is determined based on the configuration associated with the higher SCS.

4. The method according to claim 1, further comprising: The BS receives a Radio Resource Control (RRC) configuration indicating a third SCS, wherein the third SCS corresponds to either the first SCS or the second SCS. The determination of the number of BDs is also based on the third SCS.

5. The method according to claim 1, wherein, The monitoring of the DCI includes: A subset of the BD is executed in the second search space.

6. The method according to claim 1, wherein, At least one of the following: the first search space includes a first plurality of search spaces, or the second search space includes a second plurality of search spaces, and wherein monitoring the DCI includes: The total number of DCI candidates in at least one of the first plurality of search spaces or the second plurality of search spaces exceeds the number of BDs; In response to determining that the total number of DCI candidates exceeds the number of BDs, the one or more search spaces are excluded from at least one of the first plurality of search spaces or the second plurality of search spaces based on cell identifiers associated with one or more search spaces; and Further, based on search space identifiers associated with one or more other search spaces, the one or more other search spaces are excluded from at least one of the first plurality of search spaces or the second plurality of search spaces.

7. The method according to claim 1, wherein, The first configuration indicates a first monitoring period, and the second configuration indicates a second monitoring period different from the first monitoring period, and the determination of the BD quantity is also based on at least one of the following: the first monitoring period, the first SCS, the second monitoring period, or the first SCS.

8. The method according to claim 1, wherein: The first cell is the primary cell (Pcell), and the second cell is the secondary cell (Scell); The first SCS is smaller than the second SCS; The number of BDs is based on the first SCS.

9. A method for wireless communication performed by a base station (BS), the method comprising: Send a first configuration for scheduling in a first cell to a user equipment (UE), wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first subcarrier spacing (SCS). Send a second configuration to the UE for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS; Sending a third configuration to the UE indicating a third SCS associated with the number of downlink control information (DCI) blind detections (BD) in the first search space and the second search space, wherein the third SCS corresponds to one of the first SCS or the second SCS; and Based on the number of DCI BDs and determining that the total number of DCI candidates in the first search space and the second search space exceeds the number of DCI BDs, a DCI is sent to the UE in the second search space, wherein the sending is further based on a search space identifier associated with the second search space.

10. The method of claim 9, further comprising: The number of DCI BDs is determined based on the capabilities of the third SCS and the UE.

11. The method according to claim 9, wherein, The transmission of the third configuration indicating the third SCS includes: transmitting a Radio Resource Control (RRC) configuration including the third configuration to the UE.

12. The method according to claim 9, wherein: The first cell is the primary cell (Pcell), and the second cell is the secondary cell (Scell); The first SCS is smaller than the second SCS; The number of DCIBDs is based on the first SCS.

13. A user equipment (UE), comprising: The transceiver is configured as follows: Receive a first configuration for scheduling in a first cell from a base station (BS), wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first subcarrier spacing (SCS). Receives from the BS a second configuration for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS; and The processor is configured as follows: Downlink control information (DCI) is monitored in the second search space based on the number of blind detections (BDs), wherein the number of BDs is based on at least one of the first SCS or the second SCS, and wherein the processor configured to perform the monitoring is further configured to: The second search space, instead of the first search space, is allocated for the monitoring, wherein the allocation is in response to determining that the total number of DCI candidates in the first and second search spaces exceeds the number of BDs, and wherein the allocation is based on a search space identifier associated with the second search space.

14. The UE according to claim 13, wherein, The processor is configured to determine the number of BDs, including the processor being configured to perform the following operations: Select the lower SCS between the first SCS and the second SCS; and The number of BDs is determined based on the configuration associated with the lower SCS.

15. The UE according to claim 13, wherein, The processor is configured to determine the number of BDs, including the processor being configured to perform the following operations: Select the higher SCS between the first SCS and the second SCS; and The number of BDs is determined based on the configuration associated with the higher SCS.

16. The UE according to claim 13, wherein, The transceiver is also configured to: The BS receives a Radio Resource Control (RRC) configuration indicating a third SCS, wherein the third SCS corresponds to either the first SCS or the second SCS. The processor is configured to determine the number of BDs, including the processor being configured to determine the number of BDs based on the third SCS.

17. The UE according to claim 13, wherein, The processor is configured to monitor the DCI, including the processor being configured to perform the following operations: A subset of the BD is executed in the second search space.

18. The UE according to claim 13, wherein, At least one of the following: the first search space includes a first plurality of search spaces, or the second search space includes a second plurality of search spaces, and wherein the processor is configured to monitor the DCI, including the processor being configured to perform the following operations: The total number of DCI candidates in at least one of the first plurality of search spaces or the second plurality of search spaces exceeds the number of BDs; In response to determining that the total number of DCI candidates exceeds the number of BDs, the one or more search spaces are excluded from at least one of the first plurality of search spaces or the second plurality of search spaces based on cell identifiers associated with one or more search spaces; and Further, based on search space identifiers associated with one or more other search spaces, the one or more other search spaces are excluded from at least one of the first plurality of search spaces or the second plurality of search spaces.

19. The UE according to claim 13, wherein, The first configuration indicates a first monitoring period, and the second configuration indicates a second monitoring period different from the first monitoring period, and the processor is configured to determine the number of BDs, including the processor being configured to determine the number of BDs based on at least one of the following: the first monitoring period, the first SCS, the second monitoring period, or the first SCS.

20. The UE according to claim 13, wherein: The first cell is the primary cell (Pcell), and the second cell is the secondary cell (Scell); The first SCS is smaller than the second SCS; The number of BDs is based on the first SCS.

21. A base station (BS), comprising: The transceiver is configured as follows: Send a first configuration for scheduling in a first cell to a user equipment (UE), wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first subcarrier spacing (SCS). Send a second configuration to the UE for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS; Sending a third configuration to the UE indicating a third SCS associated with the number of downlink control information (DCI) blind detections (BD) in the first search space and the second search space, wherein the third SCS corresponds to one of the first SCS or the second SCS; and Based on the number of DCI BDs and determining that the total number of DCI candidates in the first search space and the second search space exceeds the number of DCI BDs, the DCI is transmitted to the UE in the second search space, wherein the transceiver configured to transmit is further configured to: The DCI is sent in the second search space based on the search space identifier associated with the second search space.

22. The BS of claim 21, further comprising a processor configured to: The number of DCI BDs is determined based on the capabilities of the third SCS and the UE.

23. The BS according to claim 21, wherein, The transceiver is configured to transmit the third configuration indicating the third SCS, including that the transceiver is configured to transmit a Radio Resource Control (RRC) configuration including the third configuration to the UE.

24. The BS according to claim 21, wherein: The first cell is the primary cell (Pcell), and the second cell is the secondary cell (Scell); The first SCS is smaller than the second SCS; The number of DCIBDs is based on the first SCS.

25. A user equipment (UE), comprising: A unit for receiving from a base station (BS) a first configuration for scheduling in a first cell, wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first subcarrier spacing (SCS). A unit for receiving from the BS a second configuration for scheduling in the first cell, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS; and A unit for monitoring downlink control information (DCI) in the second search space based on the number of blind detections (BD), wherein the number of BDs is based on at least one of the first SCS or the second SCS, and wherein the unit for monitoring includes: A unit for allocating the second search space instead of the first search space for the monitoring, wherein the allocation is in response to determining that the total number of DCI candidates in the first search space and the second search space exceeds the number of BDs, and wherein the allocation is based on a search space identifier associated with the second search space.

26. The UE according to claim 25, wherein, The unit used to determine the number of BDs includes: A unit for selecting a lower SCS between the first SCS and the second SCS; and Units used to determine the number of BDs based on the configuration associated with the lower SCS.

27. The UE according to claim 25, wherein, The unit used to determine the number of BDs includes: A unit for selecting a higher SCS between the first SCS and the second SCS; and Units used to determine the number of BDs based on the configuration associated with the higher SCS.

28. The UE according to claim 25, further comprising: A unit for receiving from the BS an indication of a third SCS radio resource control (RRC) configuration, wherein the third SCS corresponds to either the first SCS or the second SCS. The unit used to determine the number of BDs is also based on the third SCS.

29. The UE according to claim 25, wherein, The unit for monitoring the DCI includes: Units for performing a subset of the BD in the second search space.

30. The UE according to claim 25, wherein, At least one of the following: the first search space includes a first plurality of search spaces, or the second search space includes a second plurality of search spaces, and wherein the unit for monitoring the DCI includes: A unit for determining that the total number of DCI candidates in at least one of the first plurality of search spaces or the second plurality of search spaces exceeds the number of BDs; A unit for excluding one or more search spaces from at least one of the first plurality of search spaces or the second plurality of search spaces based on a cell identifier associated with one or more search spaces in response to determining that the total number of DCI candidates exceeds the number of BDs; and A unit for further excluding the one or more other search spaces from the first plurality of search spaces or the second plurality of search spaces based on search space identifiers associated with one or more other search spaces.

31. The UE according to claim 25, wherein, The first configuration indicates a first monitoring period, and the second configuration indicates a second monitoring period different from the first monitoring period, and the determination of the BD quantity is also based on at least one of the following: the first monitoring period, the first SCS, the second monitoring period, or the first SCS.

32. The UE according to claim 25, wherein: The first cell is the primary cell (Pcell), and the second cell is the secondary cell (Scell); The first SCS is smaller than the second SCS; The number of BDs is based on the first SCS.

33. A base station (BS), comprising: A unit for sending a first configuration for scheduling in a first cell to a user equipment (UE), wherein the first configuration is associated with a first search space in the first cell, and wherein the first cell is associated with a first subcarrier spacing (SCS). A unit for sending a second configuration for scheduling in the first cell to the UE, wherein the second configuration is associated with a second search space in a second cell different from the first cell, and wherein the second cell is associated with a second SCS different from the first SCS; A unit for transmitting to the UE a third configuration of a third SCS associated with the number of downlink control information (DCI) blind detections (BD) in the first search space and the second search space, wherein the third SCS corresponds to one of the first SCS or the second SCS; and A unit for transmitting a DCI to the UE in the second search space based on the number of DCI BDs and determining that the total number of DCI candidates in the first search space and the second search space exceeds the number of DCI BDs, wherein the unit for transmitting is further based on a search space identifier associated with the second search space.

34. The BS according to claim 33, further comprising: Units used to determine the number of DCI BDs based on the capabilities of the third SCS and the UE.

35. The BS according to claim 33, wherein, The unit for transmitting the third configuration indicating the third SCS includes: a unit for transmitting a Radio Resource Control (RRC) configuration including the third configuration to the UE.

36. The BS according to claim 33, wherein: The first cell is the primary cell (Pcell), and the second cell is the secondary cell (Scell); The first SCS is smaller than the second SCS; The number of DCIBDs is based on the first SCS.

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